Black sputum after quitting smoking may be a physiological reaction, or it may be considered to be related to lung cancer and respiratory bleeding.
1. Physiological reaction: Tobacco contains more harmful substances, such as tar and nicotine. Frequent smoking accumulates a lot of harmful substances in the lungs, which can form phlegm. After quitting smoking, the airway can automatically mix the harmful substances inside the lungs, such as nicotine and tar, with phlegm to form black phlegm, which can be discharged through coughing.
2. Lung cancer: Lung cancer is a kind of malignant tumor, and the cancer cells that cause lung cancer originate from the mucous epithelium of bronchial tubes. Patients with lung cancer have black sputum, which is considered to be related to the fact that cancerous tissues in the lungs invade small blood vessels in the lungs, such as small arteries and veins, which may lead to local bleeding. If the bleeding can not be discharged in time, stale blood is formed, which leads to black sputum when the patient coughs.
3. Respiratory bleeding: There are many reasons for respiratory bleeding, for example, tuberculosis, bronchiectasis combined with infection, which may lead to respiratory bleeding. For example, bleeding is not discharged in time, old bleeding, can also lead to black sputum.
In addition to this, inhalation of car exhaust, severe haze air, etc., the above substances stimulate the airway secretion of mucous phlegm, may also cough up black sputum.
To summarize, coughing up black sputum may be a normal manifestation, or it may be considered to be related to infection, if necessary, go to the respiratory medicine department of the hospital, you can look for the cause.