Brown sputum can sometimes be mucus mixed with a small amount of old blood, but it can also occur with throat irritation, a chest infection, smoking/vaping, or heavy air pollution. In Delhi, pollution can worsen cough and airway irritation, but do not assume pollution is the cause.

Because this is new and could represent blood in sputum, arrange an urgent in-person medical assessment today or within 24 hours, especially if it happens again. A clinician may check your lungs and decide whether you need a chest X-ray or sputum tests. Tuberculosis is one possible cause of coughing blood in India, particularly if you have cough lasting over 2 weeks, fever, night sweats, weight loss, or TB exposure, but one episode does not mean you have TB.

Go to an emergency department now / call 112 in India if you have:

Until seen: avoid smoking/vaping, do not take aspirin or ibuprofen unless prescribed, stay hydrated, and take a photo of the sputum if it occurs again. Coughing up blood, even small amounts, should be checked, as NHS guidance advises.

Was it definitely from coughing out of your chest, rather than bleeding gums, a nosebleed dripping backward, or vomit? And do you have cough, fever, chest pain, shortness of breath, weight loss, or smoking/vaping history?

Go to the emergency department now or call 112/108 in Delhi if brown sputum is accompanied by any of these:

The combination of coughing blood with breathing difficulty, chest/upper-back pain, or a fast heartbeat needs emergency assessment, as described in NHS emergency guidance.

If it was only one small brown streak, you feel otherwise well, and it does not recur, it is less likely to be an immediate emergency, but you should still arrange a doctor visit within 24 hours, particularly in Delhi where TB and respiratory infections need consideration. If you get a cough lasting over 2 weeks, fever, night sweats, weight loss, or the brown sputum returns, seek prompt evaluation.

If you have only brown sputum and no breathlessness, chest pain, fever, dizziness, fast heartbeat, or visible red blood, it is less likely to be an immediate emergency.

Brown sputum may be from:

However, because this is new and brown sputum can sometimes contain old blood, please arrange a visit with a general physician or chest specialist within the next 24-48 hours, especially if it occurs again tomorrow. They can examine you and decide if you need a chest X-ray or sputum testing. Medical sources advise evaluation for any possible blood in sputum, even when the amount is small, because the cause needs to be identified. MedlinePlus explains that brown sputum can represent old blood or inhaled dust/material.

For tonight:

Seek urgent care immediately if it becomes red/bloody, increases in amount, keeps recurring, or you develop cough, fever, night sweats, weight loss, chest pain, or breathlessness. In Delhi, a persistent cough or blood-stained sputum also warrants checking for respiratory infection including TB.