Why often can constipation meet recently

Recently, constipation is often considered due to improper diet, drinking too little water, and may be caused by gastrointestinal function decline, or due to intestinal flora disorders. Usually should drink more water, eat more fresh vegetables and fruits, develop the habit of regular defecation. Menstruation three months did not come and endocrine disorders, need to go to the regular hospital obstetrics and gynecology examination.