Srotas, meaning channels or pores, are present throughout the visible body as well as at the “invisible” or subtle level of the cells, molecules, atoms, and subatomic strata. It is through these channels that nutrients and other substances are transported in and out of our physiologies. It is also through these channels that information and intelligence spontaneously flow. When the flow of appropriate nutrients and energies through these channels is unimpeded, there is health; when there is excess, deficiency, or blockage in these channels disease can take root. Some srotas have obvious correlates with western concepts (e.g. both Ayurveda and allopathy recognize the anna vaha srota, or gastrointestinal channel and the prana vaha srota, or respiratory passageways. Other srotas have no western correlate: artava vaha srota or udaka vaha srota, carrying the monthly menstrum and the pure water in the body, respectively.

Together with knowledge of the doshic imbalances, the dhatus (tissues) involved, the state of the agni (digestive fire), and other diagnostic means, assessment of the srotas is one of the means in Ayurveda by which diseases can be distinguished. By knowing which srotas are affected and the nature and extent of their disturbance, one can understand a great deal about the disease process.

Three srotas connect the individual to the external environment, by bringing air, food, and water into and out of the body.
Seven srotas are associated with the seven bodily tissues (sapta dhatus).
Another three srotas direct wastes out of the body.