When should you see a doctor about runny nose?

A runny nose may produce clear, watery mucus or thicker discharge and can occur with a common cold, influenza, COVID-19, sinusitis, or an allergy such as house dust mite allergy or pet allergy. It can also follow irritation from smoke, dust, or dry air. The symptom by itself does not identify which condition is present; timing, fever, congestion, cough, itch, and facial pressure provide useful context.

Drink fluids, rest, and use saline nasal rinsing or spray if it suits you. Wash hands and avoid sharing towels or utensils while an infection is possible. Notice whether symptoms follow a particular room, animal, season, or exposure. A pharmacist or clinician can advise whether allergy medication is suitable, especially if you have other conditions or take regular medicines.

Seek prompt care for shortness of breath, swelling of the lips or tongue, confusion, severe dehydration, severe facial pain, swelling around an eye, or a severe headache with fever. Arrange medical advice for symptoms that are worsening rather than settling, or for discharge that is persistent and accompanied by significant pain. Children, older adults, and people with long-term conditions may need earlier guidance.

Ask whether the pattern fits infection, allergy, or sinus inflammation, whether testing is needed, and which treatments are safe with your health history. Mention fever, facial pain, breathing symptoms, recent travel, and any known triggers.