Patchy baldness is not caused by kidney deficiency, but it may be caused by heredity, mental stress and lack of nutrition. 1. Heredity: Heredity is one of the most common causes of baldness, when the patient’s parents and family suffer from baldness, the patient has a high chance of suffering from baldness. 2. Mental stress: Adverse mental stimulation will lead to abnormal secretion of glands and immune system disorders, causing phagocytic cells to attack hair follicles and hair loss. When the patient has greater work and life pressure for a long time, there may also be extensive hair loss. 3. Lack of nutrition: lack of nutrition is also one of the most common causes of baldness, hair growth requires a variety of nutrients, when the patient lacks nutrition, it will lead to baldness. When the symptoms of baldness appear in clinical patients, it is recommended that patients go to the hospital in time to clarify the cause and carry out treatment under the guidance of doctors.