9. Vincent van Gogh
Vincent van Gogh is one of the symbols of genius in Western art. He was primarily self-taught. One of his many famous paintings is Starry Night, 1889.
It is speculated that van Gogh suffered from acute intermittent porphyria. This is a group of disorders caused by an overaccumulation of porphyrin which helps hemoglobin, the protein that carries oxygen in the blood. Acute porphyrias affect the nervous system and other organs. Cutaneous porphyrias primarily affect the skin.
Others believe that van Gogh was bipolar disorder or had epilepsy.