When there is no stool after defecation wiping the anus, it is considered to be caused by the following conditions. First, it may be due to a poor diet recently, eating too much hot and dry food or too little water intake, making the stool too dry and hard, and no residue appearing through the anus when passing stool, so the paper towel is clean after wiping the anus. Secondly, it may be because the stool is granular, mostly because the stool remains in the intestine for too long, and the water in the stool is evaporated, so the stool is dry. Lastly, it may be due to liver fire, which makes the stool appear sticky and lacking in moisture. This condition, if it occurs for a long time, can easily cause anal fissures. It is recommended to eat more fruits and vegetables to ensure the moistness of the stool as well as to reduce constipation, and if necessary, it is recommended to go to the hospital for diagnosis and then for further treatment.