Pitta is one of the three doshas, the fundamental humours of Ayurveda. In its classical composition Pitta is formed chiefly of the element fire, with water, and it is the principle of transformation, governing digestion, metabolism, body heat, and the processing that turns food, sensation, and thought into usable form. When balanced it gives sharp intellect, good digestion, courage, and a warm complexion; when disturbed it is associated in the tradition with excess heat, inflammation, irritability, and acidity. Each person's constitution (prakriti) blends the three doshas in a characteristic proportion, and Ayurvedic practice seeks to keep them in balance through diet, regimen, and the rhythms of the season.
Classical Ayurvedic literature divides Pitta into five subtypes as well: pachaka pitta, seated in the stomach and small intestine, governing digestion proper; ranjaka pitta, in the liver and spleen, said to colour the blood; sadhaka pitta, seated in the heart, governing cognition, memory and the emotions; alochaka pitta, in the eyes, governing vision; and bhrajaka pitta, in the skin, governing complexion and the absorption of what is applied to it. The fivefold division lets the single broad idea of a "fire" humour account for digestion, eyesight, mood and skin tone within one framework, part of why the tridosha theory has remained the organizing structure of Ayurvedic diagnosis from the Caraka Samhita's Gupta-period redaction to present-day clinical practice. These are the concepts of the Ayurvedic tradition, presented here as that tradition frames them rather than as claims of modern physiology.