Srotodushti: Four Channel Disorders

Srotodushti is the vitiation of the channels in Ayurveda: the disturbance or derangement of the srotas, the passages through which the body’s substances move. The word joins srotas, a channel, with dushti, a spoiling or vitiation. The tradition holds that the body is threaded through with channels of every scale, carrying nourishment, wastes, the tissues and the doshas to their places, and that health depends on these channels flowing freely and correctly. When a channel is disturbed, the classical texts describe the fault in one of four ways: it may flow too much, it may be blocked, it may become knotted or dilated, or it may carry its contents into the wrong path. These four are the grammar of what can go wrong in a channel.

The source and the channels

The fourfold scheme is set out by Charaka in the fifth chapter of the Vimanasthana, the Srotovimana, which is devoted to the channels and their disorders, and it is echoed by Sushruta and Vagbhata. It presupposes the wider account of the srotas themselves, their kinds, their roots and their proper working, given in Srotas: The Body’s Channels. Srotodushti is what that account describes in its disturbed state: the same channels, now not flowing as they should.

The tradition ties the disturbance of the channels closely to the disturbance of the doshas. A vitiated dosha entering a channel is held to be able to spoil it in any of the four ways, and the same causes that disturb the doshas, chiefly unsuitable diet and routine, disturb the channels too. Above all the texts implicate ama, the sticky residue of poor digestion described in Ama: Metabolic Toxins, which is said to clog and foul the passages.

Atipravritti: excess flow

The first kind is atipravritti, excessive flow. Here a channel carries its contents in excess, overflowing or moving too freely, so that what should pass in measure passes in flood. It is a fault of too much movement, the channel driven beyond its proper rate. The tradition reads it wherever a flow that should be moderate becomes excessive.

Sanga: obstruction

The second kind is sanga, obstruction or stagnation, and it is the opposite of the first. Here the flow through a channel is blocked, slowed or held up, so that what should move freely is checked. Sanga is the fault of too little movement, a hindrance in the passage, and the tradition links it especially with the clogging of the channels by ama and by heavy, sticky material. Where atipravritti is flood, sanga is dam.

Siragranthi: nodulation

The third kind is siragranthi, the forming of nodules, knots or dilatations. Here the wall or course of a channel, particularly of the finer vessels, is distorted, gathering into a knot or swelling out of its even shape. It is a fault not of the rate of flow but of the form of the channel itself, which has lost its proper, smooth course. The texts group it among the ways a channel departs from its healthy state.

Vimarga gamana: the wrong path

The fourth kind is vimarga gamana, movement by the wrong way. Here the contents of a channel are diverted from their proper course and carried into a channel or region where they do not belong, so that a substance meant for one path appears in another. It is a fault of direction rather than of amount, the flow misdirected. The tradition reads it wherever something turns up where it ought not to be.

The four as the signs of vitiation

It is worth noting that these four are not only the kinds of channel disorder but also the cardinal signs by which the tradition recognises that a channel has been vitiated at all. Charaka presents them in the Srotovimana as the marks of a disturbed channel: where flow is excessive, where it is blocked, where the vessel is knotted or swollen, or where the contents appear in a wrong path, there a vitiation is to be read. In this way the four serve a double duty, naming both what has gone wrong and how it is known. Each of the several channels, moreover, has its own particular causes and its own tendencies of disturbance, so that the general scheme is applied afresh to each, from the channels of nourishment and of water to those that carry the wastes.

Why the model matters

The value of srotodushti is that it gives Ayurveda a precise and general language for what has gone wrong in a channel. Because the channels are the means by which the body distributes everything it needs and removes everything it must, a disturbance in them can touch whatever they serve, and being able to say which of the four faults is present, excess, blockage, distortion or misdirection, sharpens the understanding of a disturbance and guides where it might be met. The scheme fits within the tradition’s staged view of how imbalance develops and lodges, set out in Shatkriyakala: Six Stages of Imbalance, for the lodging of a dosha often shows as a vitiation of the local channel.

The honest limit is that srotodushti is a classical, largely inferred reading rather than a directly observed one. The channels of the older texts are a functional scheme as much as an anatomical one, and which of the four faults is present in a given disturbance is judged by a trained practitioner from signs weighed within the whole picture of the doshas, the fire and the tissues. It is offered by the tradition as a way of thinking about disturbances of flow, applied by a qualified practitioner, and not as a modern diagnostic measurement.

This article describes the classical Ayurvedic understanding of srotodushti and is offered for education, not as medical advice.