Celiac disease does not cause prolonged menstruation. The main clinical symptoms of patients with celiac disease are: 1. It causes an increase in leucorrhea, which can change in volume and character, and many patients have yellow leucorrhea; 2. Patients with celiac disease are prone to vaginal bleeding, which may occur after strenuous activity or after sexual intercourse; 3. Patients with celiac disease, in a few cases, may also have a slight backache. The most common cause of prolonged menstruation is still due to endocrine disorders as well as irregular menstruation and poor rest. Also, it is important to consider whether there are fibroids, endometriosis, or cervical polyps. It is advisable to go for a more systematic gynecological examination.