Coughing up phlegm with a little blood

Hard coughing can irritate the lining of the throat or bronchial tubes and leave fine red streaks in mucus. A recent cold, acute bronchitis, nasal bleeding that drains backwards, or allergic rhinitis can do this. Asthma and acid reflux may keep a cough going, while bronchiectasis can cause recurring mucus and blood because the airways are widened and prone to irritation. The amount, colour, frequency, and accompanying symptoms help a clinician judge the cause.

Note when it happened, how much blood you saw, whether it was mixed through phlegm, and any fever, chest discomfort, wheezing, or breathlessness. Avoid smoking and vaping, drink fluids, and do not force repeated throat-clearing. Arrange a medical review if it happens again, continues beyond a short episode, or you have an ongoing cough. Bring a list of medicines, especially blood thinners, and mention nose or gum bleeding.

Seek emergency help for more than a small streak, bleeding that does not stop, severe shortness of breath, blue or grey lips, faintness, confusion, or sudden chest pain. Urgent assessment is also needed when blood appears with a fast heartbeat, one-sided leg swelling, high fever, or marked weakness. These features can signal a serious lung or circulation problem and should not be watched at home.

Ask what may be irritating your airways, whether you need an examination or imaging, and which warning signs should change your plan. Discuss whether your medicines, smoking history, recent infection, or travel alter the assessment.