Can a doctor diagnose a yeast infection for free online?

A doctor cannot accurately diagnose a yeast infection online because the symptoms of yeast infection are similar to those of other diseases and sexually transmitted infections, explains the Office on Women's Health. It is better to make an appointment with a doctor for physical examinations and tests.

The symptoms of yeast infection in women include pain when urinating, soreness, burning sensation, swelling of the vulva and a thick white vaginal discharge, explains the Office on Women's Health. These symptoms are similar to those of bacterial vaginosis and several sexually transmitted infections. In men, the symptoms include itching and rashes at the head of the penis, according to the New York City Department of Health and Mental Hygiene. The patient should visit a doctor for tests to confirm a yeast infection and rule out a more serious condition.