At first he devoted himself to mathematical and astronomical studies; but from 1534 he gave himself up entirely to medicine, in which he graduated in 1530.
Alguses pühendus ta rohkem matemaatilistele ja astronoomilistele uuringutele, kuid alates 1534. aastast, pühendus ta täielikult meditsiinile, ta lõpetas selle eriala aastal 1530.