Who created the Theory of the Four Humours?

• A. Hippocrates
• B. Galen
• C. Aristotle
• D. Avicenna

Answer: (A)

The main idea here is understanding who first linked health to the balance of four bodily fluids. The Four Humours theory, naming blood, phlegm, yellow bile, and black bile, was introduced in ancient Greek medicine, and Hippocrates is regarded as the founder who framed and promoted this approach to explain illness and direct treatment—balancing the humours through diet, rest, and other therapies. Galen later expanded and systematized the theory, making it the dominant medical framework for many centuries, but the origin lies with Hippocrates. Aristotle contributed philosophically to Greek thought, not the creation of this medical theory, and Avicenna built on earlier ideas without originating the humoral concept himself. So Hippocrates is the best answer because he established the idea that health depends on balancing these four fluids.