Men with purple and black lips are not necessarily kidney deficiency, although men with kidney deficiency can have the symptoms of purple and black lips, but cardiovascular lesions, food poisoning, long-term smoking, environmental impact and other reasons can also lead to patients with this symptom, and thus it is impossible to determine whether it is kidney deficiency. When the patient has this symptom, should be combined with the specific situation, a comprehensive analysis. 1, cardiovascular lesions: due to heart disease, such as myocardial ischemia and other diseases, resulting in lower blood oxygen saturation, the lips are easy to black, purple; 2, food poisoning: some food poisoning will also lead to purple lips, accompanied by vomiting and diarrhea and other symptoms; 3, long-term smoking: men long-term smoking will also lead to blood oxygen Saturation is reduced, triggering the lips to become purple and black; 4, environmental impact: if the weather environment becomes cold, the human lips are frozen in the outside world, blood circulation slows down, the lips local blood stay longer, resulting in oxygen consumption for too long, the phenomenon of purple and black; 5, other: when the patient has a loss of appetite, long-term constipation, mental stress, liver damage and other problems, but also easy to lead to purple and black lips of male patients. If the patient’s lips are purple and black caused by kidney deficiency, it may also be accompanied by weakness of the waist and knees, insomnia and dreaminess, hair loss, qi deficiency and other symptoms. Need to adjust from their own dietary habits, lifestyle habits.