Other conditions with symptoms similar to pinworm infection include:

• Inflammation and swelling of the veins surrounding the lowest part of the intestines and the anus (hemorrhoids).
• Infections caused by other intestinal parasites (Ascaris, Trichuris, or tapeworms).
• Urinary tract infection (causing painful urination).
• Vaginal infection (causing vaginal itching and discharge).
• Irritation of the skin around the anus caused by contact with chemicals (contact dermatitis) or by long-term itching of the skin around the anus.
• Infection of the skin around the anus caused by a fungus or by bacteria (strep).

Other less common conditions with similar symptoms include skin conditions such as psoriasis, eczema (atopic dermatitis), or scabies.