Allergy Treatment in Bangkok: Hay Fever, Hives and Anaphylaxis Care
How Doctor Bangkok treats allergic rhinitis, urticaria and severe reactions, with a clear plan for each.
Clinically reviewed by Dr. Ponlawat Pitsuwan, Physician, Doctor Bangkok
Allergy is an over-reaction of the immune system to a harmless trigger, and it shows up as three main problems in primary care: allergic rhinitis (hay fever), urticaria (hives), and anaphylaxis. Each needs a different treatment. At Doctor Bangkok we identify the likely trigger, prescribe an intranasal steroid and antihistamine where appropriate, provide adrenaline auto-injectors for those at risk of anaphylaxis, and refer for skin-prick or specific IgE testing when the diagnosis is unclear.
From the clinic: Most patients who say they have an allergy really do, but the allergy they have is not always the one they think. A runny nose every morning in Bangkok is not a cold; it is usually dust mite allergic rhinitis. Hives that appear for an hour and vanish are rarely a food reaction, more often urticaria. And the reaction that scares everyone, sudden swelling and breathing difficulty, is the one that actually needs a medicine people under-use: adrenaline. My job in clinic is to sort which is which and hand over a plan that works for the next year, not just the next hour.
Allergic rhinitis (hay fever)
Allergic rhinitis presents with sneezing, clear nasal discharge, nasal itch, blocked nose, and itchy watery eyes. In Bangkok the commonest triggers are house dust mite, cockroach, pets, and pollen from specific grasses and trees. The Allergic Rhinitis and its Impact on Asthma (ARIA) guideline classifies it as intermittent or persistent, mild or moderate-severe. First-line treatment for anything beyond mild intermittent is a daily intranasal corticosteroid such as fluticasone or mometasone, which must be used regularly for 2 weeks before you judge the effect. Oral second-generation antihistamines (cetirizine, loratadine, fexofenadine) cover sneezing and itch; older drugs like chlorpheniramine sedate and should be avoided.
| Allergic rhinitis | Urticaria / anaphylaxis |
|---|---|
| Chronic nasal, eye and throat itch | Sudden hives, swelling or collapse |
| Triggered by dust, pollen, pets | Triggered by food, drug, sting |
| Daily steroid spray first line | Antihistamine for hives, adrenaline for anaphylaxis |
| Antihistamine for breakthrough | Steroid and antihistamine are adjuncts, not first line |
| Skin-prick testing where unclear | Specific IgE for trigger identification |
| Immunotherapy for long-term cure | Auto-injector and action plan for safety |
Urticaria (hives) and angioedema
Urticaria is transient, itchy red wheals that appear anywhere on the body and resolve within 24 hours without leaving a mark. Acute urticaria lasts less than 6 weeks; chronic urticaria lasts longer and is usually not caused by food despite what people assume. Treatment is a non-sedating antihistamine at standard dose, up-titrated to four times the standard dose if needed, per the European Academy of Allergy guideline. Angioedema, deeper swelling of lips, tongue or face, is managed similarly unless it involves the airway, in which case it is anaphylaxis until proven otherwise.
Anaphylaxis
Anaphylaxis is a severe systemic allergic reaction involving two or more body systems within minutes of exposure: skin (hives, flushing), airway (wheeze, throat tightness, voice change), circulation (dizziness, collapse) or gut (vomiting, cramping). Triggers include foods (especially peanuts, tree nuts, shellfish), drugs, and insect stings. First-line treatment is intramuscular adrenaline into the outer thigh, not antihistamines or steroids. Anyone with a past episode should carry two auto-injectors at all times and know how to use them. For sting-triggered reactions see our insect bite treatment page.
When to see a doctor
Book an appointment for persistent nasal symptoms, repeated hives, recurrent eczema flares, or any suspected drug or food reaction that did not need an emergency visit. Seek same-day or emergency care if you develop throat tightness, difficulty breathing, collapse, widespread hives with swelling, or a severe reaction after a sting, injection or new food; these require adrenaline and observation, not a phone call. A first-ever reaction always deserves a formal assessment so you leave with an action plan and, where indicated, an auto-injector prescription.
Red flag: If red-flag symptoms appear, do not wait. Book same-day or present to the nearest emergency department as described above.
Testing, prevention and trigger control
Skin-prick testing and specific IgE blood tests (ImmunoCAP) identify triggers when the history is unclear or when allergen immunotherapy is being considered. For dust mite rhinitis, allergen-impermeable mattress and pillow covers, weekly hot washing of bedding, reducing soft furnishings, and controlling indoor humidity cut exposure meaningfully. Sublingual or subcutaneous immunotherapy is an option for patients who do not respond to standard treatment and is the only intervention that alters the underlying disease. Keep influenza and COVID vaccinations current; allergic rhinitis and asthma share pathways, and any infection drives flares.
Summary
Allergy care is about matching the treatment to the problem, not handing everyone the same antihistamine. Allergic rhinitis needs a steroid spray used daily; hives need a non-sedating antihistamine at the right dose; anaphylaxis needs adrenaline carried in a pocket and used without hesitation. As Dr. Pitsuwan puts it: “The most under-used medicine in allergy is adrenaline. The most over-used is a drowsy antihistamine from the 1980s.” Doctor Bangkok offers same-day assessment and treatment plans from our Sukhumvit clinic and as part of our wider 24/7 medical services.
Frequently asked questions
What is the best antihistamine?
A non-sedating second-generation antihistamine such as cetirizine, loratadine or fexofenadine. Avoid older drowsy antihistamines like chlorpheniramine, which sedate and do not work better.
Why is my nose blocked every morning in Bangkok?
Usually house dust mite allergic rhinitis. Treatment is a daily intranasal steroid and mattress or pillow covers. It will not clear on antihistamines alone.
Are food allergies common in adults?
True IgE-mediated food allergy is uncommon in adults compared to children. Food intolerance and non-allergic sensitivities are more common and managed differently.
When should I carry an adrenaline auto-injector?
After any systemic reaction (anaphylaxis) to food, drug or sting, or after a reaction with airway or circulation involvement. Carry two at all times.
Can allergy shots cure allergy?
Allergen immunotherapy can modify and reduce allergic rhinitis and sting allergy long-term. It takes 3 to 5 years and is the only treatment that changes the underlying disease.
Do I need allergy testing?
Only if the trigger is unclear, symptoms are not controlled, or immunotherapy is being considered. Routine screening panels in unselected patients are not useful.
Sources
- Allergic Rhinitis and its Impact on Asthma (ARIA) 2019 update. Journal of Allergy and Clinical Immunology.
- European Academy of Allergy and Clinical Immunology (EAACI). Guideline for the management of urticaria, 2021.
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