Internal hemorrhoids cause stool thinning with anal swelling sensation is due to narrowing of anal canal by internal hemorrhoidal mass, sedentary lifestyle and constipation. Internal hemorrhoids refer to the presence of varicose veins above the dentate line, the surface of which is covered with mucous membrane. Typical symptoms are blood in the stool, prolapse of hemorrhoids and constipation. The increased size of the hemorrhoids will squeeze the feces during defecation, resulting in long and thin stools. Prolapsed internal hemorrhoids can stimulate the sensory nerve terminal tissue bands in the dentate line area, producing a sensation of anal swelling, which in turn triggers a sensation of defecation. If diagnosed with internal hemorrhoids, you should seek medical treatment in a timely manner, follow the doctor’s instructions, not unauthorized treatment, so as not to delay the condition. Pay attention to rest on weekdays, quit smoking and drinking, keep bowel movement, perianal hygiene care, reasonable arrangement of work and rest time.