If you always feel a feeling of swelling in the anus, you should promptly undergo anoscopy because the most common cause is caused by hemorrhoids, especially internal hemorrhoids, after overeating, alcohol abuse and prolonged sitting, which can lead to poor blood return to the perianal veins and induce the occurrence of hemorrhoids or lead to the aggravation of internal hemorrhoids and even blood in the bowel movement. Anoscopy can visually detect the formation of internal hemorrhoids nuclei and local congestion and edema, and you can choose to apply hemorrhoid suppositories topically, which can improve local symptoms. In addition, pay attention to the hygiene around the anus, improve the diet structure, it is best to drink more water, eat more fresh vegetables and fruits, develop the habit of defecating on time, you can properly perform the exercise of contraction of the anal levator muscle, which can improve local blood circulation and relieve the feeling of swelling, if necessary, you can also choose the surgical treatment to remove the hemorrhoids.