Does allergic rhinitis cause runny nose?

Allergic rhinitis develops when the immune system reacts to a usually harmless substance, such as pollen, house dust mites, or animal dander. Chemical signals widen local blood vessels and stimulate mucus production. The result may be a clear, thin discharge from one or both nostrils, often with sneezing, itching, or congestion. Symptoms may appear after exposure and improve when the trigger is avoided. A runny nose also occurs with viral infections and other conditions, so this symptom by itself does not identify its cause.

Notice when symptoms appear and reduce contact with the suspected trigger where possible. Gently blow your nose rather than repeatedly sniffing or rubbing it. Saline spray can help wash away irritants and soothe the lining. A pharmacist or clinician can advise whether an antihistamine or nasal spray suits you; follow the product directions and ask about correct spray technique. Keep tissues and wash your hands after blowing your nose, especially when infection is also possible.

Arrange a review if the discharge lasts longer than expected, keeps returning without a clear trigger, affects only one side persistently, or comes with facial pain, fever, reduced smell, or breathing problems. Seek urgent help for swelling of the face or throat, severe breathing difficulty, or symptoms of a serious allergic reaction. A clinician can examine your nose and select treatment based on the wider pattern.

Do my symptoms fit an allergy or another cause of runny nose? Which treatment is suitable for my age and health conditions? How should I use a nasal spray without irritating my nose? Should I be tested for particular triggers?