The main reason for the change in stool habits or traits is the disease of the anal area. When patients have anal sinusitis, anal papillitis, anal fissure and some other conditions, it will lead to pain, redness and swelling in the anal area, and the stimulation of the stool will lead to spasm in the anal area, making it difficult to discharge the stool, so it is more difficult to defecate, and the stool becomes thin. Long-term dry and rough stools can lead to recurrence of hemorrhoids, the formation of local edema, and the squeezing of the stool when it passes through the hemorrhoid area, so there will be strenuous defecation and thin stools. Long-term bowel effort should go to the hospital anorectal examination, consider the rectal area tumor caused by the tumor gradually increased, will be compressed to the intestinal canal, so in the defecation will have a hard performance, the stool will be squeezed to become thinner.