Aunt refers to menstruation. Weight gain after menstruation may be caused by over-nutritional diet and kidney disease. 1. Eating too nutritious: If you eat too much food during menstruation, then it will easily lead to over-nutrition and weight gain after menstruation. 2. Kidney disease: if the patient suffers from nephritis, nephrotic syndrome, etc., then it will also cause edema, leading to weight gain. If the weight gain is accompanied by other abnormal symptoms, then it is recommended to consult a doctor in time.