Purple lips in men may be a normal physiological phenomenon, or it may be caused by environmental factors or pathological factors such as lung disease, heart disease, blood disease and so on. 1. Physiological factors: with age, the color of the lips will be the same as the surrounding skin pigmentation, which may show the phenomenon of purple lips. In addition, intense exercise may also cause the above symptoms, and the symptoms may gradually disappear after rest. 2. Environmental factors: such as the cold environment caused by local capillary contraction of the lips, thus causing men’s lips purple. 3. Pathological factors (1) Lung diseases: such as chronic obstructive pulmonary disease, asthma, chronic pulmonary heart disease, pulmonary embolism, etc. can cause insufficient oxygen intake, resulting in a decrease in the oxygen content of the lungs, which is manifested in the symptoms of purple lips. (2) Heart disease: such as myocardial ischemia, heart failure, pericarditis, etc. can cause the blood supply function of the heart to be reduced, and the whole body’s blood supply is insufficient, which can cause the face and lips to be purple. (3) Blood diseases: such as methemoglobinemia can cause hemoglobin function abnormality, resulting in its inability to carry enough oxygen, which can cause the skin mucous membranes, lips purple phenomenon. (4) poisoning: such as nitrite, nitrobenzene and other chemical poisoning can cause methemoglobinemia, pulmonary fibrosis, resulting in a decrease in the body’s blood concentration, multi-organ failure, the symptoms of purple lips. If a man’s lips are purple for a long time without relief, or even have difficulty in breathing and other symptoms, he should consult a doctor in time to find out the cause of purple lips and actively treat it, so as not to delay the condition.