Long-term constipation can be caused by bad dietary habits, disease factors, drug side effects and other reasons. 1. Bad dietary habits: some people like to eat some fine food, do not like to drink water, etc., may cause fecal dryness, feces in the water content is low, which in turn causes constipation, manifested in long-term stool a grain of symptoms. 2. Disease factors: when suffering from irritable bowel syndrome, intestinal space-occupying lesions, hypothyroidism and other diseases, may also lead to dry stools, manifested in long-term symptoms of a grain of stool. 3. Drug side effects: If you take clozapine, olanzapine and other drugs for a long time, there may be side effects that affect defecation, manifesting as a symptom of one grain of stool. In addition to the above reasons, lack of exercise, poor defecation habits, excessive tension, etc., may also have an impact on the stool, manifested in the symptoms of a grain of stool. Long-term constipation symptoms of a grain of stool, it is recommended to go to the hospital in a timely manner, after the doctor’s interview, combined with the patient’s own condition and the relevant items of the examination, to clarify the cause of the disease, targeted treatment.