Allergy Treatment in Phuket: Hives, Food Reactions, Hay Fever and Anaphylaxis
Clinically reviewed by Dr. Ponlawat Pitsuwan, Physician, Takecare Clinic Phuket. Last reviewed: September 2026.
“Holidays in Phuket are full of first times: the first taste of a new curry, the first insect sting, the first time using a new sunscreen or a new antibiotic from a pharmacy. That is why we see so many allergic reactions. Most are itchy welts that settle with a tablet. Now and then a person arrives with swollen lips after a seafood dinner, and those are the visitors I want to see immediately, not the next morning.” Dr. Ponlawat Pitsuwan
What is an allergy?
An allergy is an overreaction of the immune system to something that is usually harmless, called an allergen. The body produces an antibody called IgE against the allergen, and on the next exposure, mast cells and IgE antibodies work together: the IgE sits on the surface of mast cells in the skin, nose, airways and gut, and these cells release histamine and other chemicals. Histamine causes itching, redness, swelling, sneezing and a runny nose. In a severe reaction, called anaphylaxis, these chemicals affect the whole body, causing swelling of the airway, a drop in blood pressure and collapse.
Common allergens for visitors to Phuket include foods (shellfish, peanuts, fish), insect stings from bees, wasps and fire ants, medicines (especially antibiotics and anti-inflammatory painkillers), latex, pet dander (tiny flakes of skin from cats and dogs, common in villas with resident pets), and airborne allergens such as house dust mites and mould, which thrive in humid climates.
Types of allergic reaction, and how to tell them apart
Allergic rhinitis (hay fever)
Allergic rhinitis causes sneezing, an itchy, runny or blocked nose, and itchy, watery eyes. In Phuket it is usually triggered by dust mites and mould in hotel rooms and air-conditioning units rather than by pollen. Unlike a cold, there is no fever, and symptoms persist as long as you are exposed. It can also make asthma worse.
Hives (urticaria) and swelling (angioedema)
Hives are raised, itchy, red or pale welts that move around the body, with each welt usually fading within 24 hours. Angioedema is deeper swelling of the lips, eyelids, hands or feet. Acute hives often follow a food, a medicine or an insect sting, but in many cases, particularly in children, a viral infection is the trigger and no allergy is ever found.
Food allergy
Thai food presents specific challenges. Shellfish, including prawns, crab and squid, is common and also hides in shrimp paste (kapi), used in many curry pastes and dipping sauces, and in oyster sauce. Fish sauce (nam pla) is in almost every savoury dish, which matters for people with fish allergy. Peanuts are used in satay sauce, pad thai, som tam (papaya salad) and massaman curry, and woks and utensils are often shared, so cross-contamination is common. Reactions usually start within minutes to two hours of eating.
| Reaction | Typical signs | What to do |
|---|---|---|
| Hay fever (allergic rhinitis) | Sneezing, itchy nose and eyes, no fever | Non-sedating antihistamine, steroid nasal spray; clinic if not settling |
| Localised hives or itchy rash | Itchy welts, patient otherwise well | Antihistamine; walk-in visit if spreading or recurring |
| Swelling of lips, eyes or face without breathing problems | Angioedema | Clinic now for treatment and observation |
| Anaphylaxis | Throat or tongue swelling, hoarse voice, wheeze, dizziness, collapse, vomiting | Adrenaline auto-injector into the thigh, call 1669 |
How we diagnose and treat allergies at Takecare
The doctor asks what you ate, touched, took or were stung by in the hours before, how fast the reaction appeared and whether you have had reactions before. We check your airway, breathing, blood pressure and skin. For most reactions, the history is the diagnosis.
For hay fever and hives, the first-line treatment is a non-sedating antihistamine such as cetirizine, loratadine or fexofenadine, taken once a day. For hives that do not settle, doctors sometimes increase the antihistamine dose above the standard amount, which is only done under medical advice. A steroid nasal spray such as fluticasone or mometasone is the most effective treatment for a persistently blocked, runny nose, and works best when used daily for several days. Antihistamine eye drops help itchy eyes. A short course of oral corticosteroid tablets may be added for severe hives or swelling.
For significant reactions we give injectable treatment in the clinic and observe you until you are stable, because some reactions return a few hours later. You leave with a plan for avoiding the trigger and managing any recurrence. If you have had anaphylaxis, we will explain how to use an adrenaline auto-injector and strongly advise referral to an allergy specialist at home for formal testing. For severe insect sting allergy or persistent hay fever, that specialist may also discuss allergen immunotherapy, a course of gradually increasing doses of the allergen given over months to years to retrain the immune system; this is started and supervised by an allergist, not during a holiday clinic visit.
The Phuket angle: food, insects, sea and sun
Beyond food, several local triggers cause allergic-looking reactions. Fire ant, bee and wasp stings can cause large local swelling or, in sensitised people, anaphylaxis; our page on insect bite treatment in Phuket covers bites and stings in more detail. Jellyfish and sea lice stings cause itchy, raised rashes that look like hives but are a toxin reaction rather than an allergy, as explained in our guide to jellyfish sting treatment. New sunscreens, after-sun lotions, mosquito repellents and henna tattoos can cause contact dermatitis, an itchy, blistering rash where the product touched the skin. Medicines bought over the counter, especially antibiotics and ibuprofen, are another frequent cause.
When to see a doctor
See a doctor if hives are spreading or have lasted more than a day or two despite antihistamines, if you have swelling of the lips, eyelids or face, if a rash started after a new medicine, or if hay fever symptoms are ruining your sleep or triggering asthma. Anyone who has ever had anaphylaxis should be seen after any new reaction, even a mild one.
Anaphylaxis is a medical emergency. Call 1669 if there is swelling of the tongue or throat, difficulty breathing or swallowing, a hoarse voice, wheeze, dizziness or fainting, pale and clammy skin, or confusion. Use an adrenaline auto-injector first if one is available. Even if the adrenaline works, you still need hospital observation afterwards.
Prevention and early detection
If you have a known food allergy, carry a card written in Thai that names the food, such as shrimp, shrimp paste, fish sauce or peanuts, and explains that even small amounts are dangerous. Show it at every meal. Choose simple dishes you can see being cooked, and be cautious with curry pastes and sauces. If you have been prescribed adrenaline auto-injectors, carry two at all times, including on the beach and on boat trips, and keep them out of direct sun.
For hay fever, start a daily antihistamine or nasal spray at the beginning of your stay rather than waiting for symptoms. Ask for a room with good ventilation and a clean air-conditioning filter. Patch-test a new sunscreen on a small area first.
Visiting Takecare Clinic in Phuket
We are open 24 hours a day at Takecare Clinic Bangtao (Cherngtalay) near Laguna, Takecare Kata-Karon and our Patong clinic. No appointment is needed, and antihistamines, nasal sprays and other medicines come from our on-site pharmacy.
For itching or swelling that makes it hard to leave your room, a doctor can visit your hotel or villa. Send a photo of the rash on WhatsApp or call 081-718-9080. For breathing difficulty or collapse, call 1669.
We confirm the price before your visit, offer direct billing with most travel insurers, and provide a medical report and itemised receipt for claims.
Related services and treatments
Allergies overlap with several other conditions. A blocked nose and sneezing with fever and aches is more likely an infection, so see our pages on flu treatment and COVID-19 care in Phuket. Postnasal drip can cause a scratchy throat that feels like it needs sore throat treatment, while swollen, white tonsils suggest tonsillitis. Allergic wheeze is covered on our asthma treatment in Phuket page.
A lingering cough may be bronchitis, and a blocked nose on a flight can lead to ear infection treatment. For anything else, a walk-in doctor in Phuket is available day or night.
Summary
Allergic reactions are common on holiday in Phuket because of new foods, insects, medicines and skin products, plus humid air that favours dust mites and mould. Hay fever and hives usually respond to non-sedating antihistamines and nasal steroid sprays. Swelling of the face needs prompt medical care, and anaphylaxis needs adrenaline and a call to 1669. People with food allergies should carry a Thai-language allergy card and, if prescribed, two adrenaline auto-injectors.
“If you have a serious food allergy, assume shrimp paste, fish sauce or peanuts could be in any dish until someone tells you otherwise, and keep your adrenaline with you, not in the hotel safe. If a reaction starts, use it early. It is always safer to use it and not need it than the reverse.” Dr. Ponlawat Pitsuwan
Frequently asked questions
What should I do if my hives are spreading?
Take a non-sedating antihistamine such as cetirizine or loratadine and see a doctor the same day if the hives keep spreading, involve your face or lips, or follow a new food or medicine. Spreading hives alone are usually treatable in one visit. Any swelling of the tongue or throat, breathing difficulty or dizziness is an emergency, so call 1669.
Is fish sauce safe if I have a shellfish allergy?
Fish sauce is made from fermented fish, so it is mainly a risk for people allergic to fish. However, many Thai dishes also contain shrimp paste, dried shrimp or oyster sauce, which are shellfish, and cross-contamination in shared woks is common. If you have a shellfish allergy, ask about every sauce and paste, carry a Thai allergy card, and keep adrenaline with you.
Can you test what I am allergic to?
We manage the acute reaction and document the most likely trigger based on your history. Formal allergy testing, with skin prick or specific IgE blood tests, is best done a few weeks after a reaction and interpreted by an allergy specialist, so we usually recommend arranging it at home. Where useful, testing can be arranged through partner laboratories.
Can I get allergy treatment without an appointment?
Yes. All three Takecare branches in Bangtao, Kata and Patong are open 24 hours a day for walk-ins. You are usually seen within minutes, and significant reactions are treated straight away. You can send a photo of your rash on WhatsApp before you come if you would like advice on how urgent it is.
Can a doctor treat an allergic reaction at my hotel?
Yes, for reactions such as hives, itching or mild swelling, a doctor can visit your hotel or villa anywhere in Phuket, day or night, and bring treatment. For signs of anaphylaxis, such as throat swelling, breathing difficulty or fainting, use adrenaline if you have it and call 1669 for an ambulance rather than waiting.
Is allergy treatment covered by travel insurance?
Most travel insurance policies cover treatment for an allergic reaction that happens during your trip, including consultation, medicine and observation. Some policies exclude known pre-existing allergies unless declared, so check your wording. We offer direct billing with most travel insurers and provide a medical report and itemised receipt for claims.
Sources
NHS: Anaphylaxis. NHS: Hives. NHS: Allergic rhinitis.
Allergy, allergic reaction, IgE, histamine, allergic rhinitis, hay fever, urticaria, hives, angioedema, anaphylaxis, food allergy, shellfish allergy, peanut allergy, fish allergy, shrimp paste, fish sauce, contact dermatitis, drug allergy, insect sting allergy, antihistamine, cetirizine, loratadine, fexofenadine, fluticasone, mometasone, corticosteroid, adrenaline, epinephrine auto-injector, skin prick test, NHS, Bangtao, Cherngtalay, Kata, Karon, Patong, Phuket, Dr. Ponlawat Pitsuwan, Takecare Clinic Phuket.
This page is general health information and not a substitute for a medical consultation.