Get medical help immediately if any of these apply
- Coughing up blood, in any amount.
- Difficulty breathing, breathlessness at rest, or the sense of not getting enough air.
- Chest pain with breathing or coughing.
- Blue or grey lips or fingertips.
- Noisy, high-pitched breathing that came on suddenly, or any suspicion of an inhaled object.
- Cough with high fever and shaking chills.
- Unexplained weight loss, drenching night sweats, or a cough lasting more than three weeks.
- In an infant: rapid breathing, chest drawing in with each breath, or difficulty feeding.
This list is not exhaustive. Anything sudden, severe, or rapidly worsening needs immediate medical attention regardless of what any website says. In India, call 112 for any emergency or 108 for an ambulance. Elsewhere, use your local emergency number.
Why length matters
Clinicians group coughs roughly by duration, because that changes what is likely. Acute means under three weeks and is usually infection. Subacute, three to eight weeks, is often the tail of an infection that has already resolved. Chronic, beyond eight weeks, usually has a different explanation and needs proper assessment.
In India specifically, a cough lasting more than two to three weeks is a standard prompt to be assessed for tuberculosis. That is a routine, sensible check rather than cause for alarm.
Common causes
- Viral respiratory infection — the usual cause of a short-lived cough.
- Post-infectious cough — a dry cough persisting for weeks after the infection has cleared.
- Asthma — often dry, worse at night, after exercise, or in cold air.
- Post-nasal drip from allergy or sinus problems — a persistent need to clear the throat.
- Acid reflux — cough worse when lying down or after meals, often without heartburn.
- Smoking and air pollution — significant everyday contributors.
- Medication side effect — some blood pressure medicines cause a persistent dry cough.
- Tuberculosis — an important consideration for any cough beyond two to three weeks.
What to notice before a consultation
- How long it has lasted, as precisely as you can.
- Dry or productive, and if productive, what the sputum looks like.
- When it is worst — night, morning, after eating, on exertion, in cold air.
- What comes with it — fever, weight loss, night sweats, wheeze, heartburn, blocked nose.
- Smoking history, occupational dust or fume exposure, and any recent contact with someone who has TB.
- Every medicine you take, including recently started ones.
Which doctor treats this
Picking the wrong speciality for a first consultation costs time and money. These are the specialities that commonly handle this, though your particular situation may point elsewhere — work out which specialist to see.
- General physician or family doctor — the right first stop for most coughs.
- Pulmonologist or chest physician — for a chronic cough, suspected asthma, or suspected TB.
- ENT specialist — where post-nasal drip or throat symptoms dominate.
- Gastroenterologist — where reflux appears to be the driver.
- Paediatrician — for any child, especially with breathing difficulty.
- Emergency department — for any red flag above.
Questions worth asking your doctor
- Given how long this has lasted, do I need a chest X-ray or a TB test?
- Could any medicine I take be causing this cough?
- Might this be asthma or reflux rather than an infection?
- Do I actually need an antibiotic, or would it make no difference here?
- How long should I expect this to take to settle, and when should I come back?
How DoctoGuide can help
This page is general information — it cannot know your age, history, medicines, or how your symptoms actually present. DoctoGuide asks those follow-up questions, then gives you guidance specific to what you described, a sense of urgency, the speciality to see, and a written summary to take into the consultation. It is free and needs no account.
DoctoGuide does not diagnose, prescribe, or replace a doctor. What it can and cannot do is set out on the medical safety page.