Moon sickness is a generic term for various illnesses caused by cold after delivery or after a small birth, with no fixed onset time and varying from person to person. Patients with menstrual disease usually show symptoms such as postpartum depression, dizziness, body chills, sweating, postpartum rheumatism, back and knee pain. In some patients, menstrual disease can be evident at 1-3 months after delivery, but in some patients, there are no symptoms during the menstrual period, and menstrual disease will only show when their resistance decreases. Therefore, it takes 6 weeks for a woman to recover after giving birth, so that her body can roughly return to its pre-birth state, and this period is medically known as the puerperium. Besides, patients need to pay attention to warmth and rest, and can exercise appropriately, but they should avoid overexertion, touching cold water, and eating cold, spicy and stimulating foods.