Many women will have joint pain during menstruation, especially the knee joint, which is called menstrual joint pain. Menstrual joint pain generally begins about a week before menstruation, increases when walking, and decreases after rest; It is obvious when you stretch your knees (down stairs) and disappear when you bend your knees (up stairs). The knee joint is slightly swollen, with slightly higher skin temperature and deep tenderness. After menstruation, knee pain can gradually slow down or even disappear completely. Most patients are often accompanied by abdominal distension, diarrhea, breast pain, limb edema and other symptoms. This phenomenon is closely related to the disorder of water and salt metabolism during menstruation. In the premenstrual period, the hormone level in women has changed obviously. At this time, the secretion of estrogen and aldosterone is not harmonious, resulting in the retention of water and salt, and excessive water and salt accumulate in the tissues of the body, causing edema to varying degrees, especially in the face, hands and feet. Because the human knee joint is full of adipose tissue, water and salt retention causes the fat pad to swell, which further compresses the nerve endings around the joint and causes pain. Menstrual joint pain can be prevented by the following methods: 1. Life should be regular, work and rest should be combined, enough sleep should be kept, and mental stress and mood swings should be avoided as far as possible. 2. Premenstrual diet should be light, salty, nutritious and digestible. 3. Proper exercise at ordinary times, especially before menstruation, walking and climbing mountains are conducive to relieving symptoms. People with severe joint pain can take drugs, such as fenbid and voltarin. Or take Chinese patent medicines such as Danggui Pill, Mugua Pill or Duhuo Jisheng Pill. Under the guidance of a doctor.