Health LibrarySymptomsPersistent Cough: What It Could Mean
Symptoms

Persistent Cough: What It Could Mean

A cough lasting more than 3 weeks deserves a closer look.

Medically reviewed
Updated 2026

Categories of cough

Acute (under 3 weeks), subacute (3–8 weeks), and chronic (over 8 weeks). Each has a different differential.

Red flags

Blood in sputum, unexplained weight loss, night sweats, or breathlessness need urgent evaluation.

Concerned about your symptoms?

Start a free AI-led clinical interview on Milli. Every diagnosis is verified by a licensed Indian doctor.

Educational content only

Milli's Health Library provides general educational information reviewed against peer-reviewed medical sources. It is not a diagnosis, prescription, or medical advice. Milli does not recommend medications. Always consult a licensed doctor before starting, stopping or changing any treatment.

Have a symptom on your mind? Ask Milli.

Get an instant, evidence-based clinical interview — verified by licensed doctors.