The feeling of swelling in the anus but normal stool may be related to hemorrhoids, sinusitis, perianal abscess and other causes. 1. Hemorrhoids: when the internal hemorrhoids with feces prolapse, the external hemorrhoids part of the edema, thrombosis, inflammation, can lead to the emergence of anal swelling, but the phenomenon of normal stool. 2. Sinusitis: It is caused by inflammation and proliferation of anal papillae. When sinusitis occurs, it will lead to localized burning and swelling in the anus. Inflammatory stimulation can cause recurrent episodes of sinusitis, causing secretions to flow out of the anus. As the inflammation intensifies and spreads, even perianal abscess or anal fistula can be formed. 3. Perianal abscess: when the perianal infection will lead to local pus phenomenon, so that the normal muscle tissue into pus, which leads to anal swelling, and stool can be normal. When there is a feeling of swelling in the anus, but the stool is normal, it is recommended to go to the hospital for a detailed examination to clarify the cause of the disease, so as to facilitate targeted treatment.