Sore Throat From Allergies: Signs, Treatment and Prevention

01How

How allergies cause a sore throat

When you are allergic to pollen, dust mites, pets or mould, your nose and sinuses produce extra mucus. Some of it drains down the back of the throat (postnasal drip), irritating the lining and causing a scratchy, tickly or sore throat and a need to clear it. Nasal blockage also pushes you to breathe through your mouth, particularly at night, which dries the throat and makes it sore on waking. Allergic inflammation can also directly irritate the throat and cause itching. See postnasal drip and garganta seca: remedios caseros (Spanish).

02Compare

Allergy, cold or strep throat: how to tell

• Allergy: scratchy or itchy throat, sneezing in bouts, clear runny nose, itchy eyes, no fever, lasts weeks while exposed, often seasonal or linked to places such as dusty rooms or pets.
• Cold: sore throat that peaks in 1–2 days, often with a low fever, body aches, thicker mucus and cough; usually clears in 7–10 days.
• Strep throat: sudden, severe sore throat, painful swallowing, fever, swollen tonsils with white patches, tender neck glands and usually no cough or runny nose. See strep throat.
• Reflux: burning or sour taste, worse in the morning or after meals. See burning throat.
• If in doubt, a doctor can examine you and, if needed, test for strep.

03Triggers

Common triggers

• Pollen from trees (spring), grasses (late spring and summer) and weeds (late summer and autumn).
• Dust mites in bedding, carpets and soft furnishings.
• Pet dander from cats, dogs and other animals.
• Mould in damp rooms and outdoors in autumn.
• Irritants that are not allergens but worsen symptoms: smoke, perfumes, cleaning products, pollution and dry air.
• Cross-reactions: in pollen allergy, raw fruit and vegetables can itch the mouth and throat (oral allergy syndrome).

04Home

Home care for the sore throat

• Drink plenty of fluids; warm drinks with honey (not for babies under 1 year) soothe.
• Gargle with warm salty water (half a teaspoon of salt in a glass).
• Use lozenges or sugar-free sweets to boost saliva.
• Use a humidifier at night if the air is dry, keeping it clean.
• Rinse your nose with saline to flush allergens and mucus. See neti pot sinus rinse.
• Shower and change clothes after being outdoors on high-pollen days; wash hair before bed.
• Avoid smoke and strong fragrances.
• Rest the voice and avoid whispering.

05Medicines

Medicines that treat the cause

• Non-sedating antihistamines (cetirizine, loratadine, fexofenadine) reduce sneezing, itching and runny nose.
• Steroid nasal sprays (fluticasone, mometasone, budesonide) are the most effective single treatment for allergic nasal symptoms and reduce postnasal drip; they work best used daily and take several days to reach full effect.
• Antihistamine nasal sprays and eye drops for specific symptoms.
• Leukotriene blockers (montelukast) on prescription in some cases.
• Decongestant sprays only for 3 days at most because of rebound congestion.
• Throat lozenges and pain relief (paracetamol or ibuprofen) as needed.
• Ask a pharmacist if you are pregnant, take other medicines or have heart or blood pressure problems.

06Prevent

Preventing allergic throat irritation

• Check pollen forecasts and keep windows closed on high-pollen days.
• Use allergen-proof covers on mattress and pillows, and wash bedding weekly at 60 °C.
• Reduce dust: damp-dust, vacuum with a HEPA filter and avoid heavy carpets.
• Keep pets out of the bedroom and wash them regularly.
• Fix damp and mould; keep indoor humidity under 50%.
• Start allergy medicines before the pollen season if your doctor recommends.
• Allergen immunotherapy (injections or tablets) is an option for people with severe, persistent allergy.

07Night

Sore throat on waking

Waking with a dry, sore throat often reflects mouth breathing due to a blocked nose. Treat the nasal congestion, rinse your nose before bed, raise your head slightly and keep the bedroom cool and clean. Persistent morning sore throat can also come from reflux, snoring or sleep apnoea; see snoring remedies and mouth breathing.

08Children

Allergic sore throat in children

Children with allergies often clear their throat, cough, sniff and rub their nose (“allergic salute”). Dark circles under the eyes, a persistent blocked nose and mouth breathing are clues. Avoid giving cough and cold medicines to young children. Saline rinses, allergen control and a paediatrician-guided antihistamine or nasal spray are the usual approach. Enlarged adenoids can mimic or worsen the picture.

10Cases

Three common situations

Scratchy throat, sneezing and itchy eyes every May: likely pollen allergy; antihistamine, nasal steroid and pollen avoidance.

Sore throat on waking with a blocked nose all year: consider dust mites or pets; clean bedding, rinse nose, ask about a nasal spray.

Severe sore throat with fever and pus on tonsils: not an allergy; see a doctor for strep testing.

11Summary

Key points to remember

A scratchy sore throat with sneezing, itchy eyes and clear mucus and no fever points to allergy. Treat the allergy with avoidance, saline, antihistamines and nasal steroids, and soothe the throat with fluids and gargles. Seek medical advice for fever, severe pain, breathing problems or persistent symptoms. Our ENT team can help you identify triggers and plan treatment.

This guide is for general information and does not replace an examination by your own doctor or ENT specialist.