Women with stomach pain when they have their menstruation, consider the following reasons: 1. Menstrual syndrome: Due to the sudden reduction of sex hormones in the body during menstruation, the body will produce discomfort, so there will be stomach pain, bloating and other uncomfortable symptoms. 2. Premenstrual adverse factors: It may be due to endocrine dysfunction caused by cold body, excessive fatigue, emotional disorders, improper diet before menstruation. 3. Decline in physical quality ：With basic gastrointestinal diseases on weekdays, the body quality is lower during menstruation, which strengthens the gastrointestinal symptoms. When menstruation comes, you should pay attention to eating warm, soft, light and easily digestible food, avoiding bad stimuli such as strong tea, coffee and alcohol, avoiding the intake of raw, cold, hard, spicy and stimulating food, eating less and more meals, ensuring sufficient sleep and maintaining a good mood to promote the recovery of the condition.