The main consideration is that the stool is not round and a little flat due to gastrointestinal diseases, such as hemorrhoids, intestinal space-occupying lesions or intestinal inflammation. 1. Hemorrhoids: due to the congestion and enlargement of the venous plexus of the anal canal or lower rectum, which can lead to narrowing of the anus, so that the stool is squeezed when it passes through, and becomes not round and a little flat. At this time, patients also appear perianal itching, pain, stool with blood symptoms. 2. Intestinal inflammation: such as acute gastroenteritis, inflammatory bowel disease, etc., the intestinal tract in the stimulation of inflammation may appear dysfunction, resulting in increased water in the stool, may also make the stool shape change, become not round and a little flat. 3. Intestinal space-occupying lesions: such as intestinal polyps, rectal cancer and other diseases, will make the process of stool formation in the intestinal tract is squeezed, the shape of the stool changes, resulting in the stool is not round and a little flat. If the patient has long-term or recurring bowel movements, it is recommended to consult a doctor in time to find out the cause of the disease and carry out targeted treatment to avoid delaying the condition.