Coughing Blood (Haemoptysis)

You may assume that a small streak of blood is harmless, or that coughing blood always means cancer. Neither assumption is safe. Many causes are treatable and non cancerous, but any true haemoptysis needs timely assessment because the amount and cause can change.

What haemoptysis means Haemoptysis means coughing up blood that comes from the airways or lungs. The blood may appear as small red spots or flecks, thin streaks in mucus, pink or blood stained sputum, fresh red blood, or blood clots. Sputum is mucus or phlegm coughed up from the lower airways. The visible amount does not identify the cause. A few streaks may follow airway irritation or infection, but they can also be the first sign of a condition requiring investigation. NHS guidance advises urgent assessment even when only small spots, flecks or streaks are present. Blood can appear to come from the lungs when it does not Your clinician will first try to confirm where the blood came from. Blood may instead have come from a nosebleed draining into the throat, bleeding gums or another mouth injury, the throat, or vomiting blood from the oesophagus or stomach. Blood brought up by coughing is more suggestive of haemoptysis. Blood brought up with nausea, retching or vomiting may represent gastrointestinal bleeding. This distinction is not always obvious from appearance alone. Do not delay seeking help while trying to determine the source yourself. Estimating the amount can be difficult Blood spreads through mucus, saliva and toilet water, so the amount may look larger or smaller than it is. Rather than relying on an exact volume, clinicians consider whether there were only a few spots or streaks, whether you coughed up fresh blood or clots. Whether it happened once or repeatedly, whether the amount is increasing, whether bleeding is continuing, and whether you are breathless, faint or unwell. More than a few spots or streaks is treated as an emergency by NHS guidance, particularly when accompanied by breathing difficulty, chest or upper back pain, or a very fast heartbeat. Common causes involve irritated or infected airways Possible causes include a severe or prolonged cough, bronchitis, pneumonia, another chest infection, tuberculosis, or bronchiectasis. Bronchiectasis is a condition in which sections of the airways become widened and are more likely to collect mucus, become infected and bleed. A forceful cough can damage small surface blood vessels. However, the presence of a severe cough does not prove that irritation is the only cause. NHS guidance advises that coughing blood is checked even when an infection or prolonged cough seems likely. A pulmonary embolism is an important emergency cause A pulmonary embolism is a blood clot blocking an artery in the lungs. Possible symptoms include sudden breathlessness, chest pain that may be worse when breathing in, coughing blood, a fast heartbeat, light headedness or collapse, and pain, redness or swelling in one leg. Not everyone has every symptom. A pulmonary embolism can be life threatening and requires urgent hospital assessment. Lung cancer is one possible cause, but not the only one Coughing blood can occur with lung cancer, particularly when it is unexplained or recurrent. Other features that may increase concern include a persistent or changing cough, unexplained weight loss, reduced appetite, persistent chest pain, increasing breathlessness, recurrent chest infections, past or current smoking, or previous asbestos exposure. Most people assessed for coughing blood will not necessarily have cancer. Referral or investigation is intended to identify the cause rather than confirm a diagnosis. Current NICE guidance recommends a suspected cancer pathway referral for people aged 40 or over with unexplained haemoptysis. Other causes are possible Haemoptysis can also occur with inflammation of the airways or lungs, lung injury, abnormal blood vessels, some heart conditions, disorders affecting blood clotting, recent airway procedures, and rare immune or blood vessel conditions. The list of possibilities changes according to your age, past health problems, medicines and accompanying symptoms. A known lung condition does not make new or increasing bleeding automatically normal. Medicines can affect the severity of bleeding An anticoagulant is a medicine that reduces the blood's ability to clot. Examples include warfarin, apixaban, rivaroxaban, edoxaban and dabigatran. Anticoagulants and antiplatelet medicines can make bleeding more likely or more difficult to stop. They may worsen bleeding from another underlying problem rather than being the whole explanation. Tell the clinician about every prescribed medicine, aspirin or anti inflammatory medicines, non prescription products, recent medicine changes, missed or extra doses, and previous clotting or bleeding disorders. Do not stop an anticoagulant on your own unless an emergency clinician or your individual treatment plan tells you to do so. Stopping it unexpectedly may increase the risk of a dangerous blood clot. The timing and pattern provide clues Your clinician may ask when the bleeding started, what you were doing at the time, whether it occurred with a cough, vomiting or a nosebleed. How many episodes occurred, whether the blood was mixed with sputum, whether there were clots, whether the amount has changed, whether you have fever or shivering. Whether there is chest pain or breathlessness, whether you have lost weight or appetite, whether you have had leg swelling or recent immobility. Whether you have travelled recently, whether you smoke or have past exposure to asbestos, and whether you have previously had tuberculosis, cancer or bronchiectasis. These questions organise the possibilities. No single answer establishes the diagnosis. Your clinician assesses immediate stability first Assessment may include breathing rate, oxygen level, heart rate, blood pressure, temperature, level of alertness, chest examination, examination of the mouth and nose, signs of anaemia or poor circulation, and examination of a swollen or painful leg. Severe haemoptysis can threaten life by blocking the airway as well as through blood loss. The amount of blood alone is therefore not the only measure of severity. Tests depend on the presentation Possible investigations include a chest X ray, blood count, clotting tests, kidney and liver tests, infection testing, a sputum sample, CT scanning, tests for pulmonary embolism, and bronchoscopy. Bronchoscopy uses a flexible camera to examine the windpipe and larger airways. It may help locate bleeding, investigate an abnormal scan or obtain samples. Not everyone needs every test. The order depends on how unwell you are and which causes are most likely or dangerous. A normal first test may not end the assessment A normal chest X ray does not answer every possible cause of haemoptysis. Further assessment may still be needed when bleeding recurs, symptoms persist, you are aged 40 or over with unexplained haemoptysis. You have significant smoking or occupational exposure, you have weight loss or other concerning symptoms, or the clinician remains concerned despite an initial normal result. Safety netting should state what happens next and when you should return. What to do after a small amount If you notice only a few small spots, flecks or streaks: arrange an urgent GP assessment or contact NHS 111, note whether the bleeding happens again. Describe the approximate amount and whether it was mixed with sputum, note accompanying symptoms, take an updated medicines list, and follow any existing lung condition action plan without letting it delay assessment. Do not wait several weeks to see whether unexplained haemoptysis settles. Do not rely on self treatment Cough medicines, antibiotics or inhalers should not be used to avoid assessment. Antibiotics help only when an appropriate bacterial infection is suspected. Borrowed antibiotics may delay the correct diagnosis or cause side effects. Do not start, stop or change medicines that affect bleeding, such as aspirin, anti inflammatory painkillers or anticoagulants, without clinical advice. Tell the assessing clinician about all these medicines. Follow up must match the level of uncertainty A safe plan should explain the most likely cause, which serious causes are being considered, what tests have been arranged. Who will review the results, when the next contact should occur, what to do if bleeding returns, and which symptoms require 999. Seek reassessment even after a reassuring consultation if the blood returns, increases or is accompanied by new symptoms.

Coughing blood is a symptom, not a diagnosis. A safe assessment asks whether the blood genuinely came up with a cough, how much was present, whether bleeding is continuing or increasing, whether breathing, circulation or consciousness are affected, and which test can identify the likely source and cause. The immediate priority is keeping the airway and breathing safe; identifying the underlying cause comes next.