Hyperhidrosis is a condition in which the sympathetic nerves are overexcited or highly stressed, causing excessive sweat secretion. The sympathetic nerve governs sweating throughout the body. Normally, the sympathetic nerve regulates body temperature by controlling sweating and heat dissipation, but the sweating and facial flushing of patients with hyperhidrosis completely lose their normal control, leaving patients in a state of helplessness, agitation or panic on a daily basis. The causes are broadly divided into three categories, one is due to systemic diseases, the second is psychogenic sweating, and the third is gustatory sweating, which is another physiological phenomenon. Hyperhidrosis due to high sympathetic nervousness is excessive skin sweating. Most of them are related to mental factors such as nervousness, fear, anxiety and anger. It occurs in the palms of the hands, soles of the feet, forehead, armpits, and vulva. In mild cases of hyperhidrosis, the skin is just moist and sticky; in severe cases, sweat beads drip non-stop, especially when emotionally excited. Many patients have wet and cold hands and feet, palms and soles of the skin bruises. When the soles of the feet are sweaty, the skin is impregnated and white, and the toes are eroded, which can lead to mycotic infections. In addition, the decomposition of sweat often produces a foul odor. Hyperhidrosis due to high sympathetic tension is caused by excessive secretion of small sweat glands, which manifests as abnormal excessive sweating throughout the body or locally. Hyperhidrosis is divided into localized hyperhidrosis and generalized hyperhidrosis. Localized hyperhidrosis, which most often begins in adolescents and some have a family history, can last for several years, but there is a natural tendency for it to diminish after the age of 25. The most common sites are the palmar-plantar and friction surfaces, such as the axillae, groin, and perineum. This is followed by the forehead, tip of the nose, and chest. Palmoplantar sweating can be persistent or transient, caused by mood swings, without seasonal distinction, and is often accompanied by coldness or even cyanosis of the hands and feet, which can be accompanied by keratinization of the hands and feet over time. Axillary sweating can be triggered by heat or mental activity. Axillary sweating is caused by excessive activity of the small sweat glands, unlike axillary odor which is mainly caused by the sweat glands; secondly, generalized hyperhidrosis, which is mainly caused by systemic diseases.