learnthai.co
Transliteration

Lessons

The Body and What Hurts (bpùat, jèp, mêuay)

What you will be able to do

Name any part of the body head to foot, say what kind of hurt it is by choosing correctly between bpùat, jèp and mêuay, add how bad it is and how long it has gone on, and recognise the questions a Thai pharmacist or doctor asks back.

You have the body word and you have the word for hurt, and you are still going to say the wrong thing, because Thai does not have one word for hurt. It has three, they are not degrees of the same thing, and the one you pick tells the person in front of you what kind of problem you have before you say anything else. Choose wrong and you have not spoken badly. You have reported a different complaint, and the examination goes looking in the wrong place. That is what this lesson is for. It teaches you how to name the part and describe the sensation, which is language and not medicine: nothing here tells you what is wrong with you or what to do about it, and the answer to every question of that kind is to ask a pharmacist or a doctor. Start with the sentence shape, because it is short and you will use it unchanged all day. Thai puts the hurt verb first and the body part straight after it, with nothing in between. No preposition, no "my", no subject. ปวดหัว (bpùat hǔa) is not three words waiting for a fourth. It is a finished sentence meaning "I have a headache", and putting ผม (phǒm) or ฉัน (chǎn) in front of it only makes it heavier. Add the politeness and you are done: ปวดหัวครับ (bpùat hǔa khráp). The negative is ไม่ (mâi) in front of the verb, ไม่ปวด (mâi bpùat), ไม่เจ็บ (mâi jèp), and to deny the body part rather than the verb you need ไม่ใช่ (mâi châi) instead, which is why "it is my back, not my stomach" comes out as ปวดหลังครับ ไม่ใช่ท้อง (bpùat lǎng khráp, mâi châi tháwng). The full logic of those two negatives is in saying no: the negatives. Now the three verbs. ปวด (bpùat) is the deep one. It is under the surface, it has no edge you could draw round, it beats or presses or grinds on its own without anybody touching it, and it is the word for the aches that get people out of bed at three in the morning: ปวดหัว a headache, ปวดท้อง (bpùat tháwng) a stomach ache, ปวดฟัน (bpùat fan) toothache, ปวดหลัง (bpùat lǎng) a bad back. If you were asked to point at it you would spread a hand over an area rather than put a fingertip on a spot. เจ็บ (jèp) is the sharp one, and it is the word for anything with a surface. A cut, a graze, a burn, a sting, a bite, a place that has been hit. It is also the word for pain that arrives when something touches you or when you move a particular way, which is why a doctor pressing your abdomen asks กดตรงนี้เจ็บไหม (gòt dtrong-níi jèp mǎi) and not กดตรงนี้ปวดไหม. If you can cover it with one fingertip, and pressing it makes it worse, it is เจ็บ. เมื่อย (mêuay) is the muscle one. It is what a body part feels like after it has been used: a day at a desk, four hours on a bike, an hour in a dentist's chair with your mouth held open. It is tiredness in the meat of the thing rather than damage to it, and the test that separates it from the other two is what a firm thumb would do. Pressing a เจ็บ is unbearable. Pressing a เมื่อย is the reason massage shops exist. เมื่อย is in fact the massage word. A shop opens with ปวดตรงไหนเป็นพิเศษไหม (bpùat dtrong nǎi bpen phí-sèet mǎi), is anywhere hurting in particular, and shortens it to เมื่อยตรงไหน (mêuay dtrong nǎi); the phrases for that hour are on salon and massage. So the test you can run in the moment has three questions and you take them in order. Can you cover the spot with one fingertip, and would pressing it make it worse? Then เจ็บ. Is it under the surface, spread out, with no edge, throbbing on its own while nothing touches it? Then ปวด. Did it come from using that part, and would a firm thumb on it feel good rather than terrible? Then เมื่อย. Anything with a wound, a burn or a bite is เจ็บ whatever else it feels like, because the surface is broken and that settles it. One place the line genuinely blurs is the belly: ปวดท้อง and เจ็บท้อง (jèp tháwng) are both ordinary and nobody will correct you. The pair that does not blur, and the one worth drilling, is ปวดคอ against เจ็บคอ. Four more words fill the gaps the three verbs leave. ตุบๆ (dtùp-dtùp) is the throb, and ปวดตุบๆ (bpùat dtùp-dtùp) is the pain that keeps you awake; the dentist page has it whole as ปวดตุบๆทั้งคืนเลยครับ, throbbing all night. ร้าว (ráao) is pain that travels, which is why the doctor asks เจ็บร้าวไปตรงไหนไหม (jèp ráao bpai dtrong nǎi mǎi) — answer with where it goes, not where it starts. ตึง (dteung) is tight rather than painful, and ตึงๆแต่ไม่เจ็บ (dteung-dteung dtàe mâi jèp) is the answer that stops a therapist or a dentist pressing harder. ชา (chaa) is numb, and it is not a kind of hurt at all: ชาตรงนี้ครับ (chaa dtrong-níi khráp). The same ชา sits inside ยาชา (yaa-chaa), the numbing injection, which is a word you are likely to meet before you need the adjective. Here is what to fix before anything else. These three are not a scale. เจ็บ is not "worse than" ปวด and ปวด is not "worse than" เมื่อย. They describe the character of the sensation, not the amount of it, and how bad it is gets said separately with its own words. A learner who reaches for เจ็บ because it hurts a great deal, or ปวด because it only hurts a little, has told the doctor something false about the nature of the problem and nothing at all about its severity. The cleanest proof of how much work these verbs do is คอ (khaw). คอ is both the neck and the throat, one word for both, and in a clinic the pain verb is what separates them. ปวดคอ (bpùat khaw) is a stiff neck. เจ็บคอ (jèp khaw) is a sore throat. Same body word, two complaints that have nothing to do with each other, and the only thing separating them is which verb sits in front. Get this pair the wrong way round at a pharmacy and at best you will be asked to say it again, because the two send her to different shelves. ฟัน (fan) does the same trick with three verbs. ปวดฟัน is the toothache that keeps you awake, coming from inside the tooth. เจ็บ is what you report when they press it, or when biting on that side hurts. And there is a third word that belongs to teeth in particular, เสียว (sǐao), the short electric zing you get from something cold, which is neither an ache nor a sharp hurt and has no single English word. Keep เสียว attached to its body part as เสียวฟัน (sǐao fan); the dentist page explains why the bare word is not one to leave loose, along with ซี่ (sîi), the classifier you need in order to say which tooth: at the dentist. Saying where is the other half of the job, and Thai does it with the body word plus a finger. ตรงนี้ (dtrong-níi) means "right here" and it is the most useful two syllables in a consulting room: เจ็บตรงนี้ with a finger on the spot, or ปวดตรงนี้ for the deeper kind. The question that comes back at you is ตรงไหน (dtrong nǎi), which spot, in เจ็บตรงไหน or ปวดตรงไหน or the softer ไม่สบายตรงไหน (mâi sà-baai dtrong nǎi). Pointing while you speak is not a failure of Thai. Thai patients do it too, and it is more accurate than any vocabulary you could bring with you. When you need to narrow it further, ข้างซ้าย (khâang-sáai) and ข้างขวา (khâang-khwǎa) are the left and right sides, ข้างบน (khâang-bon) and ข้างล่าง (khâang-lâang) are upper and lower, ข้างใน (khâang-nai) is inside, and ข้างนี้ (khâang-níi) is this side of me. ข้าง is also the classifier for one of a paired part, so ขาข้างซ้าย (khǎa khâang-sáai) is the left leg and ตาข้างขวา (dtaa khâang-khwǎa) is the right eye. How bad and how long come next, and both are formulaic enough to learn whole. Intensity sits after the verb: ปวดนิดหน่อย (bpùat nít-nàwy) is a bit, ปวดมาก (bpùat mâak) is a lot, and when it has gone past what you can put up with, ทนไม่ไหว (thon mâi wǎi), "I cannot stand it". That last one says you have reached your limit, and the machinery behind ไหว (wǎi), which is about capacity rather than permission, is in the three ways to say "can". For change over time you want ดีขึ้น (dii khêun) better, แย่ลง (yâe long) worse and ปวดน้อยลง (bpùat náwy long) hurting less, all of which sit in comparing things. The end of it is หาย (hǎai), to be cured: หายแล้วครับ (hǎai láew khráp) it has cleared up, ยังไม่หายครับ (yang mâi hǎai khráp) not yet, and หายไวๆนะคะ (hǎai wai-wai ná khá) is what staff send you off with. Duration runs on one frame you will use at every visit: the symptom, then มา (maa), then a number, then a time word, then แล้ว (láew). ปวดหัวมาสามวันแล้ว (bpùat hǔa maa sǎam wan láew), three days now. For a starting point rather than a stretch, use ตั้งแต่ (dtâng-dtàe): ตั้งแต่เมื่อคืน (dtâng-dtàe mêua-kheun) since last night, ตั้งแต่เช้า (dtâng-dtàe cháo) since this morning. Duration is the doctor's next question after any symptom, so have the number ready before you sit down, and see past, future and already for what แล้ว is actually doing in there. How the damage happened takes โดน (doon), the everyday passive: โดนแมลงกัด (doon má-laeng gàt) something bit me, โดนน้ำร้อนลวก (doon nám ráwn lûak) scalded, and the rest of that verb is in four verbs that stretch. For the serious end of all this, see hospital and insurance and emergencies and police. Then there is the other family of complaints, the ones that are conditions rather than sensations, and they take เป็น (bpen). เป็นไข้ (bpen khâi) a fever, เป็นหวัด (bpen wàt) a cold, เป็นผื่น (bpen phèun) a rash, เป็นแผล (bpen phlǎe) a wound, เป็นลม (bpen lom) fainted. The logic is set out in the four answers to English "is": เป็น is the verb for having an illness, which is also why เป็นอะไร (bpen à-rai) means "what is wrong with you" rather than "what are you". Two things about this set are worth pinning down. First, fever is said both ways and neither is wrong: เป็นไข้ names the illness, มีไข้ (mii khâi) says the temperature is up, and both are ordinary in a patient's mouth — the clinic page's own line is มีไข้ตั้งแต่เมื่อคืนค่ะ. Staff use มีไข้ from about 37.5 upwards. Second, and this is the exception that catches everyone, ท้องเสีย (tháwng-sǐa) does not take เป็น. It is already a verb phrase, ท้อง plus เสีย, the belly gone bad, so it stands on its own and takes the duration frame directly: ท้องเสียมาสองวันแล้ว (tháwng-sǐa maa sǎwng wan láew). เป็นท้องเสีย is not what people say. And when you cannot name any of it, the fallback that asks no diagnosis of you is ไม่สบาย (mâi sà-baai), unwell, which the pharmacy page calls the default Thai way of saying you are not right and which covers everything from a head cold to food poisoning: ไม่สบายมาสองวันแล้ว, and then point. แพ้ (pháe) deserves its own paragraph, because it is the sentence here that can matter most and it is grammatically the easiest thing in the lesson. แพ้ is a plain verb and it takes its object bare, with no preposition and no "to": แพ้ยา (pháe yaa), allergic to medicine, แพ้อาหารทะเล (pháe aa-hǎan thá-lee), allergic to seafood. The negative is ไม่แพ้ (mâi pháe), and that is the answer to give when you are asked, rather than a shake of the head. Nothing else has to be built. What needs care is which word goes after it, and the pages already carry that: the pharmacy page has the drug side, including the trap that แพ้ยา and ยาแก้แพ้ (yaa gâe pháe), an antihistamine, are opposite things, at at the pharmacy; the clinic page has getting the allergy written onto your record with ขอเขียนไว้ในประวัติ (khǎw khǐan wái nai bprà-wàt) rather than merely said aloud, at at the clinic; and the food side is on ordering food. Two more facts help you hear the word in the wild. แพ้ also means to lose, as in a match, so context is doing real work; and the standing condition of being an allergic person is ภูมิแพ้ (phuum-pháe), which is what a doctor says when the verdict is allergies rather than an infection. Last, learn the questions coming back at you, because the conversation starts with them and not with your prepared sentence. เป็นอะไรมา (bpen à-rai maa) is the first question you will actually hear, and มา here means "came in with", so the answer is the complaint. มีอาการยังไงบ้าง (mii aa-gaan yang-ngai bâang) asks for the list, อาการ (aa-gaan) being the word for symptom. เป็นมากี่วันแล้ว (bpen maa gìi wan láew) is the duration question. มีไข้ไหม (mii khâi mǎi), กินอะไรมา (gin à-rai maa), กินยามาหรือยัง (gin yaa maa rěu yang) and แพ้ยาอะไรไหม (pháe yaa à-rai mǎi) follow close behind. You do not have to produce elegant Thai in reply. You have to recognise which of those was just asked and answer it with a body word, a pain verb, a number and a particle. When it goes past you, พูดช้าๆได้ไหม (phûut cháa-cháa dâi mǎi), or พูดช้าๆอีกทีได้ไหม (phûut cháa-cháa ìik thii dâi mǎi), and เขียนให้หน่อยได้ไหม (khǐan hâi nàwy dâi mǎi) are on the clinic, pharmacy and dentist pages, and using them beats nodding, because the nod is taken as agreement and the instruction is not repeated.

The body, head to foot

ThaiSoundMeaning
หัวhǔaHead. Also the head of other things: the head of a queue, the front of a bike. ปวดหัว (bpùat hǔa) is the ordinary headache phrase.
ผมphǒmHair on the head. Spelled and said exactly like the male "I", so the sentence has to carry the difference. ตัดผม (dtàt phǒm) is a haircut.
ตาdtaaEye. ตาแดง (dtaa daeng) is a red eye. น้ำตา (nám-dtaa) is tears, on the same น้ำ (náam) that gives น้ำมูก (nám-mûuk), nasal mucus.
หูhǔuEar. ปวดหู (bpùat hǔu) is earache. หูอื้อ (hǔu êu) is the blocked, muffled ear you get off a plane or coming up from a dive.
จมูกjà-mùukNose. The two complaints attached to it are น้ำมูกไหล (nám-mûuk lǎi), a runny nose, and คัดจมูก (khát jà-mùuk), a blocked one.
ปากbpàakMouth, and in ordinary speech the lips as well. ปากบวม (bpàak buam) is a swollen lip, and the clinic page tells you to say it at reception rather than waiting in the queue. ริมฝีปาก (rim-fǐi-bpàak) is the precise word for lips.
ฟันfanTooth. Counted with the classifier ซี่ (sîi), which is how a dental clinic asks you which one.
ลิ้นlínTongue. แลบลิ้นหน่อย (láep lín nàwy), stick your tongue out, is an examination instruction rather than a request.
กรามgraamJaw. เมื่อยกราม (mêuay graam) is short enough to get out with your mouth held open at the dentist, which is exactly when you need it.
คอkhawNeck and throat, one word for both. In a clinic the pain verb in front is what separates them. This is the pair worth drilling.
ไหล่làiShoulder, meaning the joint itself. บ่า (bàa) is the flat top of the shoulder where a desk job settles, and it is the word a massage shop wants.
แขนkhǎenArm.
มือmeuHand.
นิ้วníuFinger, and toe as นิ้วเท้า (níu tháo). It is also the inch, and Thai salons think in inches rather than centimetres.
หน้าอกnâa-òkChest. เจ็บหน้าอก (jèp nâa-òk) is chest pain, and the clinic page tells you to say it standing at the counter rather than sitting in the queue.
ท้องtháwngBelly, and by extension pregnant. ปวดท้อง (bpùat tháwng) reports pain anywhere between the ribs and the hips rather than the stomach organ in particular, so expect a doctor to narrow it by pressing rather than by your word. The pregnancy sense is why ท้องอยู่หรือเปล่า (tháwng yùu rěu bplào) is not a question about your stomach hurting.
หลังlǎngBack. The same word does duty as "after" and "behind", which is why หลังอาหาร (lǎng aa-hǎan) on a medicine bag means after food.
เอวeoWaist, the beltline. Lower-back pain comes out as ปวดหลังส่วนล่าง (bpùat lǎng sùan lâang), which is the form the massage page teaches, or as ปวดเอว (bpùat eo).
ขาkhǎaLeg.
เข่าkhàoKnee. หัวเข่า (hǔa khào), "head of the knee", is equally normal and means the same thing.
เท้าtháoFoot.
ตัวdtuaBody, the whole of you. ปวดตัว (bpùat dtua) is the general achiness a fever leaves behind, and it is what the hospital page's patient says: ปวดตัวมากค่ะ.
ผิวphǐuSkin, the surface you can see. It is where a rash comes up, where you itch and where things sting. Outside a clinic you will meet it on cosmetics shelves.
ข้อkhâwThe joint itself. It heads the names of the joints: ข้อมือ (khâw meu) wrist, ข้อศอก (khâw sàwk) elbow, ข้อเท้า (khâw tháo) ankle. The same word means a numbered item on a form. Worth loading before you come off a bike rather than after.

The three kinds of hurt, and the words beside them

ThaiSoundMeaning
ปวดหัวbpùat hǔaA headache. ปวด: deep, dull, internal, no edge, and it throbs on its own while nothing is touching it.
ปวดท้องbpùat tháwngA stomach ache. Anywhere in the belly. The word does not tell a doctor which organ, so expect them to find it by pressing. เจ็บท้อง (jèp tháwng) is ordinary too — the belly is the one place the two verbs overlap.
ปวดฟันbpùat fanToothache. The kind that comes from inside the tooth and keeps you awake.
ปวดหลังbpùat lǎngA bad back.
ปวดเข่าbpùat khàoMy knee aches.
เจ็บคอjèp khawA sore throat. Not ปวดคอ (bpùat khaw), which is a stiff neck. Same body word, unrelated complaint, and only the verb tells them apart.
เจ็บตรงนี้jèp dtrong-níiIt hurts right here. เจ็บ: sharp, on the surface, with an edge you could put a fingertip on. A cut, a graze, a burn, a bite, a place that has been hit.
เมื่อยคอmêuay khawMy neck is stiff and tired. เมื่อย: muscle tiredness from use, not damage. A screen or a bad pillow, not an illness.
เมื่อยขาmêuay khǎaMy legs ache from walking.
ปวดเมื่อยbpùat-mêuayAching all over. The two words joined, for the general achiness a fever leaves behind. ปวดตัว (bpùat dtua) says the same thing, and it is what the hospital page's patient says.
ปวดตุบๆbpùat dtùp-dtùpA throbbing ache. ตุบๆ (dtùp-dtùp) is the throb itself. The dentist page has the full line: ปวดตุบๆทั้งคืนเลยครับ, throbbing all night.
เจ็บร้าวไปที่ขาjèp ráao bpai thîi khǎaThe pain travels down my leg. ร้าว (ráao) is pain that runs somewhere else, and the clinic question is เจ็บร้าวไปตรงไหนไหม (jèp ráao bpai dtrong nǎi mǎi). Answer with where it goes, not where it starts.
ตึงๆแต่ไม่เจ็บdteung-dteung dtàe mâi jèpTight, but it does not hurt. ตึง (dteung) is pressure or tightness rather than pain, and this is the sentence that stops a therapist or a dentist pressing harder.
ชาตรงนี้ครับchaa dtrong-níi khrápIt is numb here. ชา (chaa) is not a kind of hurt at all. The same word sits inside ยาชา (yaa-chaa), the numbing injection.
เสียวฟันsǐao fanThe cold zing in a tooth. The third word teeth take, after ปวด and เจ็บ: neither an ache nor a sharp hurt, and teeth own it. Keep it attached to ฟัน.

Saying where

ThaiSoundMeaning
เจ็บตรงนี้ค่ะjèp dtrong-níi khâIt hurts right here. Say it with a fingertip already on the spot. Thai patients point too.
ปวดตรงนี้ครับ กดแล้วไม่เจ็บbpùat dtrong-níi khráp, gòt láew mâi jèpIt aches here, but pressing it does not hurt. The sentence that tells a doctor the trouble is underneath rather than on the surface, and it is only possible because the two verbs are separate words.
ปวดหลังครับ ไม่ใช่ท้องbpùat lǎng khráp, mâi châi tháwngIt is my back, not my stomach. ไม่ใช่ (mâi châi) rejects a noun, plain ไม่ (mâi) a verb. This is the repair for a body word you have already got wrong.
เจ็บข้างซ้ายค่ะjèp khâang-sáai khâIt hurts on the left side. ข้าง (khâang) doubles as the classifier for one of a pair: ขาข้างซ้าย (khǎa khâang-sáai) the left leg, ตาข้างขวา (dtaa khâang-khwǎa) the right eye.
ปวดข้างในครับbpùat khâang-nai khrápThe pain is inside.
ปวดเวลาเดินครับbpùat wee-laa doen khrápIt hurts when I walk. เวลา (wee-laa) plus a verb gives the trigger, and pain with a trigger is a different signal from pain that comes on its own.
เจ็บเวลากลืนค่ะjèp wee-laa gleun khâIt hurts when I swallow.
ไม่สบายตรงนี้ครับmâi sà-baai dtrong-níi khrápI am not right here. The fallback when you cannot decide which of the three verbs it is.

How bad, and how long

ThaiSoundMeaning
ปวดนิดหน่อยครับbpùat nít-nàwy khrápIt aches a little.
เจ็บมากค่ะjèp mâak khâIt hurts a lot. Intensity goes after the verb and is entirely separate from the choice of verb.
ปวดมากครับ ทนไม่ไหวแล้วbpùat mâak khráp, thon mâi wǎi láewIt hurts badly, I cannot stand it any more. ไหว (wǎi) is about capacity, not permission. The words that actually move you up a queue are ด่วน (dùan) and ไข้สูง (khâi sǔung), both on the clinic page.
เมื่อยหลังมาอาทิตย์นึงแล้วครับmêuay lǎng maa aa-thít neung láew khrápMy back has ached for a week. The frame is the symptom, then มา (maa), then a number, then a time word, then แล้ว (láew). Everything else swaps in and out of it.
ปวดเข่ามาสองอาทิตย์แล้วค่ะbpùat khào maa sǎwng aa-thít láew khâMy knee has hurt for two weeks.
ปวดตั้งแต่เมื่อคืนค่ะbpùat dtâng-dtàe mêua-kheun khâIt has been hurting since last night. ตั้งแต่ (dtâng-dtàe) gives a starting point where มาแล้ว gives a stretch.
เป็นๆหายๆครับbpen-bpen hǎai-hǎai khrápIt comes and goes. Doubling both verbs is how Thai says intermittent, and it is a real piece of information rather than vagueness.
วันนี้ดีขึ้นแล้วครับwan-níi dii khêun láew khrápIt is better today.
แย่ลงกว่าเมื่อวานค่ะyâe long gwàa mêua-waan khâWorse than yesterday.
ยังไม่หายเลยค่ะyang mâi hǎai loei khâStill not better at all. หาย (hǎai) is to be cured, and this is the return-visit sentence. หายแล้วครับ (hǎai láew khráp) is the other end of it, and หายไวๆนะคะ (hǎai wai-wai ná khá) is what staff send you off with.

Conditions: the words that take เป็น

ThaiSoundMeaning
เป็นไข้bpen khâiHave a fever. มีไข้ (mii khâi) is equally normal and equally yours to say; staff use it from about 37.5 upwards.
เป็นหวัดbpen wàtHave a cold.
เป็นผื่นbpen phèunHave a rash. มีผื่นขึ้น (mii phèun khêun), "a rash has come up", is the fixed pair the pharmacy page teaches: มีผื่นขึ้นที่แขนค่ะ.
เป็นแผลbpen phlǎeHave a wound. Any break in the skin, from a graze off a bike to a proper cut.
เป็นลมbpen lomFainted. Also what you say about somebody else when you are the one reporting it.
ท้องเสียtháwng-sǐaDiarrhoea. The exception: no เป็น in front of it. It is already a verb phrase, ท้อง plus เสีย, and it takes the duration frame directly.
โดนแมลงกัดครับdoon má-laeng gàt khrápSomething bit me. โดน (doon) marks something done to you, so it is how you say what caused the damage: โดนน้ำร้อนลวก (doon nám ráwn lûak) scalded, โดนแมวข่วน (doon maeo khùan) scratched by a cat.
คันkhanItch.
แสบsàepSting or burn. The surface feeling, and it belongs beside เจ็บ rather than beside ปวด.
บวมbuamSwollen. ปากบวม (bpàak buam) a swollen lip, หน้าบวม (nâa buam) a swollen face, ข้อเท้าบวม (khâw tháo buam) a swollen ankle.
ไม่สบายmâi sà-baaiUnwell. The catch-all that asks no diagnosis of you, and the default Thai way of saying you are not right. Say it, then point.

The allergy sentence

ThaiSoundMeaning
แพ้ยาครับpháe yaa khrápI am allergic to medicine. A plain verb taking a bare object. Nothing goes between them and there is no word for "to".
ไม่แพ้ค่ะmâi pháe khâI have no allergies. Say the words rather than shaking your head, because this is the one question where a misread answer is dangerous.
แพ้อาหารทะเลครับpháe aa-hǎan thá-lee khrápI am allergic to seafood.
แพ้ฝุ่นค่ะpháe fùn khâI am allergic to dust.
เป็นภูมิแพ้ครับbpen phuum-pháe khrápI have allergies. The standing condition rather than a single reaction, and it takes เป็น like the other conditions.
ไม่แน่ใจครับmâi nâe-jai khrápI am not sure. The honest answer when you do not know what you react to, and a usable one: the pharmacy page says she will keep clear of the risky shelf rather than guess for you.

What they will ask you back

ThaiSoundMeaning
เป็นอะไรมาคะbpen à-rai maa kháWhat have you come in with? The first question you will actually hear, so the exchange starts with them. Answer with the complaint, not with your name.
ไม่สบายตรงไหนคะmâi sà-baai dtrong nǎi kháWhere are you unwell? Answer with a body word and a finger, in that order.
มีอาการยังไงบ้างคะmii aa-gaan yang-ngai bâang kháWhat are your symptoms? บ้าง (bâang) asks for a list rather than one item, so give them everything.
เป็นมากี่วันแล้วคะbpen maa gìi wan láew kháHow many days have you had it? Have the number ready before you sit down; it follows any symptom you name.
ปวดตรงไหนคะbpùat dtrong nǎi kháWhere does it ache?
กดตรงนี้เจ็บไหมครับgòt dtrong-níi jèp mǎi khrápDoes it hurt when I press here? Note the verb: they use เจ็บ because they are touching you. Answer เจ็บครับ or ไม่เจ็บครับ, echoing the verb, since Thai has no all-purpose yes.
เจ็บร้าวไปตรงไหนไหมครับjèp ráao bpai dtrong nǎi mǎi khrápDoes the pain travel anywhere? Answer with where it goes, not where it starts, or with ไม่ร้าวครับ (mâi ráao khráp) if it stays put.
มีไข้ไหมคะmii khâi mǎi kháDo you have a fever?
แพ้ยาอะไรไหมคะpháe yaa à-rai mǎi kháAre you allergic to any medicine? Never nod blankly at this one. ไม่แพ้ครับ (mâi pháe khráp) if you are not, and the name if you are.

Common mistake

The mistake that does the damage is treating ปวด (bpùat), เจ็บ (jèp) and เมื่อย (mêuay) as a scale of severity. They are not. They name the kind of sensation, and how bad it is is a separate word, นิดหน่อย (nít-nàwy) or มาก (mâak). Reach for เจ็บ because it hurts a great deal and you have reported a knock on the head; say เมื่อย about a real injury and you have told a therapist the spot is safe to work on. The pair to drill until it is automatic is ปวดคอ (bpùat khaw), a stiff neck, against เจ็บคอ (jèp khaw), a sore throat. The belly is the one place the line genuinely blurs, where ปวดท้อง and เจ็บท้อง are both ordinary, so do not go looking for a rule there. Two smaller ones: put nothing between the verb and the body part, so ปวดหัว and never ปวดที่หัว; and do not build เป็นท้องเสีย, because ท้องเสีย (tháwng-sǐa) already contains its own verb. Last, when you are asked แพ้ยาอะไรไหม (pháe yaa à-rai mǎi), answer with ไม่แพ้ครับ (mâi pháe khráp) or with a name. A nod is not an answer. The question comes back before every prescription and every injection, so learn to say the words.

Next: At the pharmacy in Thai