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Hillary Clinton suffers seasonal allergies, eats a protein-rich diet and is taking a prescribed blood thinner, according to a letter released Friday by her physician outlining the state of her health.

The letter, from Dr. Lisa Bardack, the chief intenist at Mount Kisco Medical Group in New York, reveals Clinton's medical history, including her a 2012 blood clot and concussion and medications she currently takes.

The Democrat is the first presidential candidate to make her medical information publicly available.

Later Friday, the Clinton campaign is expected release eight years of tax returns on the campaign's website.

The letter from her physician lays out a 2012 episode that led to a fainting spelling and concussion. "In December of 2012, Mrs. Clinton suffered a stomach virus after traveling, became dehydrated, fainted and sustained a concussion." A follow-up exam diagnosed "transverse sinus venous thrombosis," and she was prescribed an anti-coagulation drug, which she continues to take.

The letter also reports Clinton doesn't smoke, drinks alcohol occasionally, exercises regularly and has a cholesterol reading of 195. It declares her "in excellent physical condition and fit to serve as President of the United States."