WASHINGTON (AP) — Hillary Rodham Clinton's physician describes the Democratic presidential candidate as in "excellent physical condition and fit to serve as president of the United States."

The Clinton campaign released a letter from her doctor on Friday. It addresses Clinton's health in 2012, when she sustained a concussion after fainting — a result of a stomach virus and dehydration. Testing the following year showed "complete resolution" of the concussion's effects, including double vision.

During the course of her treatment, Clinton was also found to have a blood clot and was given medication to dissolve it. She's remains on the treatment as a precaution.

Clinton is the first 2016 presidential candidate to release her health records. Her campaign says they plan to release her tax returns since 2007 later Friday.