Thirst during menstruation may be a normal physiological phenomenon, or it may be a pathological phenomenon such as diabetes, uremia and other diseases. 1. Physiological phenomenon: during menstruation, women will have a decreased appetite, salty taste phenomenon, which will lead to thirst, menstruation blood volume is relatively large, it will also lead to part of the body’s water is discharged from the body, will also lead to dehydration, thirst phenomenon. 2. Pathological phenomena (1) Diabetes mellitus: diabetes mellitus is due to the large amount of glucose in the blood will have a certain effect on the human body, elevated blood glucose will lead to increased osmotic pressure of the blood, which will stimulate the thirst center, resulting in thirst, polyuria, polyphagia, weight loss and other symptoms. (2) Uremia: Uremia is caused by the lack of antidiuretic hormone in the human body. The symptoms of uremia are thirst, increased water intake, increased urination, and increased urine output. If the symptoms of thirst during menstruation persist and are not relieved, you need to seek medical treatment.