There are several common causes for swelling of a toe: First, infection of the toe. Since the toe is inside the shoe for a long time and suffers from compression, the local environment is also moist and unclean, so it is easy to cause secondary infection. Second, tumors of the toe, common tumors such as endogenous chondrosarcoma, giant cell tumor of bone, cysts and so on can cause swelling of the tissue. Third, chronic strain and injury of the toe, local aseptic inflammation caused by long-term extrusion and weight-bearing, resulting in swelling. Fourth, trauma, local bleeding and swelling of the toes due to trauma, commonly caused by kicking, knocking, bumping, resulting in damage to the toes. Fifth, systemic factors should also be considered, such as diabetes, renal insufficiency, will also appear correspondingly swollen limbs are common causes.