There are more reasons that cause men’s lips to be black, usually not caused by kidney deficiency, there may be physiological factors, but also may be caused by diseases of the body systems. Dark lips in men is a symptom, mainly due to abnormalities in the digestive system, such as poor appetite, constipation, diarrhea, abdominal pain, etc., which can cause the lips will appear black. Another condition is melanosis, dark spots, which may be caused by chronic hyperalgesia. In addition, kidney insufficiency can also lead to pigmentation on the edge of the lips, which can lead to black lips. Long-term irregular rest can affect the supply of qi and blood, thus causing dark lips. Other conditions such as pneumonia, heart failure, diarrhea, constipation, asthma, allergies, etc., can also lead to dark lips. It can be seen that the appearance of black lips may be a pathological factor or a non-pathological factor. Patients do not need to be overly nervous, but they should not take it lightly. They can first take care of it from the aspect of life, and if there is no relief, then go to the hospital for relevant examination and targeted treatment.