Constipation in girls may be caused by bad habits, intestinal obstruction, hypothyroidism, etc. It needs to be treated with medicine or surgery for the cause. 1. Bad habits: If eating too dry and hard food, lack of dietary fiber in food, often sedentary, less activity and other physiological factors may lead to gastrointestinal peristalsis weakened, indigestion and constipation. Pay attention to eat light and easy to digest food, more activities can be, if necessary, can take lactulose and other laxative treatment. 2. Intestinal obstruction: Mechanical occupation of the intestines, obstruction of intestinal blood flow and other factors lead to feces can not be discharged through the intestines, so it will be constipated. It can be treated conservatively by rehydration, gastrointestinal decompression, etc. and surgically if necessary. 3. Hypothyroidism: the thyroid gland synthesizes and secretes insufficient thyroid hormones, resulting in the contraction of gastrointestinal smooth muscle peristalsis function is weakened, so it will be constipated. You can take levothyroxine sodium tablets to supplement thyroxine treatment. All of the above medications should be used under the guidance of a doctor, avoid self-medication. Girls constipation may also have 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.