Yeast infection (also called candidiasis) is an infection caused by the yeast Candida. The yeast is normally present in the body without causing problems, but sometimes it may multiply excessively and cause disease.
Factors that may lead to yeast overgrowth include use of antibiotic medication or oral contraceptives, hormonal changes during pregnancy, disorders such as diabetes, and reduced immunity. Symptoms vary according to the area affected.
Skin infections typically cause an itchy rash.
Oral yeast infection produces sore, creamy-yellow patches in the mouth. Vaginal yeast infection causes itching of the vulva and vagina, a thick, white discharge, and pain when urinating.
In men, the penis may be affected, causing a rash and itching or burning under the foreskin. Treatment is with antifungal medication to kill the yeast.