A runny nose (rhinorrhea) is a common symptom that can be watery or thick and affect one or both nostrils. Causes range from viral colds and seasonal allergies to irritant exposure or structural nasal issues. Below is practical information on typical causes, safe self-care steps, and when to seek medical assessment.
Viral upper respiratory infections (common colds), seasonal allergic rhinitis, exposure to smoke or strong odors, sinus inflammation and certain structural problems in the nose are frequent causes. The color or thickness of discharge alone does not reliably identify the cause; accompanying symptoms such as cough, fever, eye irritation or facial pressure are important for clinical evaluation.
Seek medical evaluation if you have fever with worsening overall condition, marked swelling or severe pain around the face or eyes, persistent or heavy nosebleeds, difficulty breathing, or altered consciousness. Sudden severe symptoms—such as major breathing difficulty or uncontrolled bleeding—require immediate emergency care.
Increasing fluid intake, using a humidifier, and saline nasal sprays or rinses can relieve symptoms. Avoid tobacco smoke and strong irritants, rest, and wash hands frequently to limit spread. If symptoms worsen or persist beyond the expected timeframe, consult a clinician for further assessment.
For short-lived, mild symptoms start with your primary care provider. Children are often seen first by a pediatrician. Recurrent, persistent or complicated nasal discharge may require assessment by an ear–nose–throat (ENT) specialist. After physical examination the clinician may recommend imaging or referral if needed.
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