Internal hemorrhoids can cause a sensation of fullness or swelling in the anus. Although the main clinical symptoms of internal hemorrhoids are bleeding and prolapse of the hemorrhoidal nodes outside the anus, any stage of internal hemorrhoids can exhibit varying degrees of this sensation. Early to middle stages of internal hemorrhoids typically involve less severe swelling, while in the later stages, when the hemorrhoidal nodes prolapse, the sensation can be significantly more intense, especially after prolonged standing or physical exertion.