Wanting to poop when standing up and not when sitting down may be caused by hemorrhoids, constipation, and rectal lesions. 1. hemorrhoids: hemorrhoids if the development of serious, prolapse in the anus around the anus, will lead to the anal region of the feeling of swelling, standing up will stimulate the patient to produce want to poop symptoms, and sit down after the feeling disappeared. 2. Constipation: If the diet is poor, the intake of water and fiber is insufficient, coupled with the slowing down of gastrointestinal peristalsis, it is easy to have dry stools, defecation difficulties. Patients will appear to stand up and want to poop, sit down on the situation of no feeling. 3. Rectal lesions: If the patient has rectal polyps, proctitis and other diseases, it may stimulate the nerves of the rectum, resulting in the symptom of wanting to have a bowel movement when standing up and not feeling it when sitting down. In addition, gastrointestinal dysfunction can also lead to the above symptoms. If the patient often appears to want to poop when he/she stands up, but not when he/she sits down, it is recommended to consult a doctor in time, under the doctor’s guidance, improve the relevant examination, clarify the cause of the disease, and treat the symptom.