To quote the 1st Google result:

the traditional Hindu system of medicine (incorporated in Atharva Veda, the last of the four Vedas), which is based on the idea of balance in bodily systems and uses diet, herbal treatment, and yogic breathing.

To quote WIkipedia:

Ayurveda names three elemental substances, the doshas (called Vata, Pitta and Kapha), and states that a balance of the doshas results in health, while imbalance results in disease. Ayurveda has eight canonical components, which are derived from classical Sanskrit literature.

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