The sputum with bright red blood is considered to be caused by tuberculosis, bronchiectasis and lung cancer.
1. Tuberculosis: patients infected with Mycobacterium tuberculosis develop when their resistance drops. At this time, the inflammation of tuberculosis foci can increase the permeability of capillaries in bronchial tubes, trachea and lungs, which will be manifested as the phenomenon of bright red blood in sputum.
2. Bronchiectasis: when the patient’s bronchial tubes and their surrounding lung tissues have chronic suppurative inflammation and fibrosis, the bronchial wall muscles and elastic tissues are destroyed, so that the bronchial tubes are deformed and persistently dilated. At this time, the bronchial arteries accompanying with it will be thickened accordingly, and if the capillaries are damaged, the phenomenon of sputum with bright red blood can appear.
3. Lung cancer: malignant tumors appear in lungs due to ionizing radiation, smoking and chronic lung infection. When the disease progresses to the late stage, the tumor can erode and damage the blood vessels, leading to rupture of blood vessels, which is manifested as the phenomenon of bright red blood in sputum.
Of course, in addition to respiratory diseases can cause the above symptoms, the digestive system, cardiovascular diseases, such as gastric hemorrhage, gastric ulcer, acute left heart failure, etc. can also cause the above symptoms. The phenomenon of sputum with bright red blood is a more serious symptom, and once it occurs, it is recommended to consult a doctor in time.