Night sweats before menstruation (abnormal sweating after going to sleep and stopping after waking up) may be caused by qi deficiency, yin deficiency and kidney deficiency. 1. Qi deficiency: Qi deficiency refers to a series of pathological changes caused by the deficiency of qi, such as yuan qi, zong qi and wei qi, etc. Patients with qi deficiency may have imbalanced metabolism and weakened kidney function, and therefore may experience night sweating and weakness before menstruation. 2. Yin deficiency: Yin deficiency is the lack of yin qi and imbalance of yin and yang in the body. Before menstruation, patients may experience night sweats due to weakness and imbalance of yin and yang in the body. 3. Kidney deficiency: Kidney essence and qi are insufficient or kidney yin and yang are deficient, leading to a decrease in the function level of the kidneys. Patients with kidney deficiency often have symptoms such as night sweats before menstruation and lumbar and knee soreness (a feeling of lumbar and knee soreness and weakness). When patients experience night sweats before menstruation, they need to consult a doctor in time to find out the cause of the disease and then give appropriate treatment.