Menstruation is also known as the female menstrual period, during menstruation due to changes in hormone levels, which may cause water and sodium retention in the female body, resulting in physiological edema, leading to a slight increase in body weight, but generally will not increase as much as 6 pounds, and the symptoms can be disappeared after the end of the menstrual period. Weight gain may be caused by overeating or illness, and the symptoms should be improved through scientific fat reduction or treatment of the original disease. If a woman overeats and does not exercise enough during her menstrual period, she may gain weight due to the accumulation of fat, which usually does not go away even after her menstrual period is over. In this case, it is necessary to reduce body fat through reasonable exercise and the right diet to achieve the effect of weight loss. Some women may experience constipation due to gastrointestinal discomfort during menstruation, and the accumulation of feces in the body may also lead to weight gain. Glycerin drugs or gastric stimulants can be used under the guidance of a doctor to promote fecal discharge, which can help reduce weight. In addition, if the weight gain is obvious, or accompanied by symptoms such as lower limb edema, heart discomfort, dizziness and headache that cannot be eliminated even after the end of the menstrual period, kidney disease, brain disease or heart disease may exist. Abnormalities in the patient’s cardiac and renal functions, obstruction of venous return as well as reduced permeability of the kidneys and fluid retention in the body can lead to weight gain. At this time, it is recommended that patients seek timely medical treatment and actively treat the primary disease, which can improve symptoms and reduce weight.