Generally speaking, a strong appetite during menstruation may be caused by endocrine changes in the body, or due to emotional instability, physical exertion and energy. 1. Endocrine changes: During menstruation, the level of estrogen and progesterone in the body decreases, and the hormonal changes may affect the appetite, which may be greater than usual. 2. Emotional instability: Due to emotional instability during menstruation, such as irritability, the patient may want to eat something to reduce the pressure and thus have a strong appetite. 3. Consumption of physical strength and energy: During menstruation, part of the blood flows out, and at this time, women carry out physical labor, which consumes a lot of physical strength and energy, and at this time, women have a strong appetite. There may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.