The cause of very dry stool and hard to come out is mainly constipation, which leads to the following causes: First, lifestyle: too little fiber intake, eating too little, suppressing the feeling of bowel movement. Second, external factors: taking certain drugs, such as opioids, anticholinergics, antidepressants, anticonvulsants, etc. Third, endocrine and metabolic factors: such as hypothyroidism, hypercalcemia. Fourth, neurological diseases: such as Parkinson’s disease, multiple sclerosis, spinal cord injury. Fifth, psychological factors: such as depression, obesity-related psychological disorders. Sixth, gastrointestinal diseases: such as pyloric obstruction intestinal obstruction, megacolon, etc. Seventh, rectal and anal canal factors: such as anal atresia or deformity, anal stenosis, rectal bulge, rectal prolapse, and intussusception. The above-mentioned causes can lead to constipation, when the patient appears constipation, to the hospital in a timely manner for relevant examination, according to the different causes to give the appropriate treatment, so as not to delay the disease.