Internal hemorrhoids don’t bleed and don’t hurt, but there are cases of swelling, which may be caused by internal hemorrhoid inflammation, edema and internal hemorrhoids prolapsing out of the anus and other reasons. 1. internal hemorrhoid inflammation: internal hemorrhoid inflammation may be due to bad habits, eating spicy and stimulating food, do not pay attention to anal hygiene, etc. may lead to internal hemorrhoid inflammation, inflammation continues to stimulate the local perianal nerves, resulting in swelling sensation. 2. edema: edema will lead to an increase in the volume of hemorrhoids, so that the perianal area of the nerve is compressed, so there will be internal hemorrhoids do not bleed and pain, but the phenomenon of swelling. 3. internal hemorrhoids prolapse outside the anus: internal hemorrhoids prolapse outside the anus will lead to expansion of internal hemorrhoidal veins, blood return is not smooth, the anus produces a certain amount of stimulation after the anus, so that the anus appears to be swollen. Other situations can also lead to internal hemorrhoids do not bleed and pain, but there is a swelling of the situation, it is recommended that the patient seek medical examination in a timely manner to clarify the cause of the disease, under the guidance of a professional doctor to carry out the appropriate treatment, to avoid delays in the condition.