Black upper lip may be caused by physiological reasons such as hyperpigmentation, and may also be caused by bronchial dilatation, pulmonary heart disease and other diseases.
1. Physiological reasons: when the upper lip area is exposed to ultraviolet radiation for a long time, there may be localized pigmentation, resulting in a black upper lip, which is a normal physiological phenomenon and usually does not require special treatment.
2. Bronchial dilatation: when the lungs are repeatedly infected or the bronchial tubes have congenital developmental defects, it is easy to induce bronchial dilatation disease. The patient will have difficulty in breathing, and when there is a serious lack of oxygen in the body, it may also cause the upper lip to turn black.
3. Pulmonary heart disease: Pulmonary heart disease may be related to pulmonary embolism and respiratory tract infections and other factors. Patients with pulmonary heart disease are prone to dyspnea after activity, and if they are unable to supplement their oxygen in time, they may also experience darkening of the upper lip.
Darkening of the upper lip may also be due to other causes, and patients should go to the hospital in a timely manner to clarify the specific causes.