Praxagoras of Cos

Praxagoras (Ancient Greek: Πραξαγόρας ὁ Κῷος) was a figure of medicine in ancient Greece. He was born on the Greek island of Kos in about 340 BC. Both his father, Nicarchus, and his grandfather were physicians. Very little is known of Praxagoras' personal life, and none of his writings have survived.

Between the death of Hippocrates in 375 BC and the founding of the school in Alexandria, Egypt, Greek medicine became entrenched with speculation, seeing little advances in medicine. During this period four men took up the study of anatomy: Diocles of Carystus (fl. 4th century BC), Herophilus (c. 335-280 BC), Erasistratus (c. 304-250 BC), and finally Praxagoras.

Galen (AD 129-216), a famous Greek physician, wrote of Praxagoras as this influential figure in Greek medicine and a member of the logical or dogmatic school. Galen also probably knew of the works of Praxagoras, writing on natural sciences, anatomy, causes and treatment of disease, and on acute diseases.

Praxagoras adopted a variation of the humoral theory, but instead of the four humors (blood, phlegm, yellow bile, and black bile) that most physicians held, he insisted on eleven. Like the other Greek physicians, he believed health and disease were controlled by the balance or imbalance of these humors. For example, if the proper amount of heat is present in the organism, the process of digestion is natural. Too little or too much heat will cause a rise in the other humors, which then produces certain disease conditions. He considered digestion to be a kind of putrefaction or decomposition, an idea that was held until the 19th century.

...
Wikipedia