+**Humoral Theory** was an ancient medical system proposing that human health and temperament stemmed from the balance of four essential bodily fluids, or [humors](/wiki/humors). An imbalance among these vital substances was believed to cause illness, guiding medical practice for centuries and shaping early understandings of [disease](/wiki/disease). This theory deeply influenced European and Islamic medicine until the 19th century.
+## See also
+- [Ancient Medicine](/wiki/ancient_medicine)
+- [Galen](/wiki/galen)
+- [Hippocrates](/wiki/hippocrates)
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