Charaka Samhita Part 22: Sutrasthana Chapter 22 (Langhanabrimhaniya Adhyaya) — The Six Therapies Ayurveda Uses to Lighten or Nourish the Body

📖 21 min read · Part 22 of the Charaka Samhita Series

Why Ayurveda Treats in Two Directions: Lighten or Nourish

Strip away the herbs, the oils and the elaborate procedures, and every Ayurvedic treatment reduces to one of two moves. Either the body is carrying something in excess and needs to be lightened, or it has been depleted and needs to be built back up. Take away, or add in. That is the whole grammar of therapy, and Chapter 22 of the Sutrasthana is the chapter that names it.

The insight goes back to the very first chapter of the Charaka Samhita, which we opened this series with. There, the sages laid down the first law of treatment: similarity (samanya) increases, dissimilarity (vishesha) decreases (Charaka Samhita, Sutrasthana 1.44). If a state is heavy, add heaviness and it grows; add lightness and it shrinks. Chapter 22 takes that abstract law and turns it into a toolkit a physician can actually reach for at the bedside.

The two great directions have classical names that later commentators used constantly: apatarpana, the depleting or lightening direction, and santarpana, the nourishing or replenishing direction. Langhana leads the first family; brimhana leads the second. But Charaka does not stop at two. He divides the work of treatment into six practical measures, because "lighten" and "nourish" are goals, and a physician needs methods. The six measures are those methods — and knowing which one a given person needs, at which season, in which dose, is precisely what separates a healer from a guesser.

This is one of the most quietly useful chapters in the whole Sutrasthana. It does not describe a single disease. Instead it hands you a way of thinking about any imbalance: first ask which direction the body needs to move, then choose the measure that moves it there without overshooting.

The framework is oddly modern. Much of contemporary ill-health falls neatly into these two piles. On one side sit the disorders of excess — too much rich food, too little movement, channels clogged with what Ayurveda would call heaviness and stagnation. On the other side sit the disorders of depletion — the burnout, the exhaustion, the fragility of a body that has been asked to run without rest. Charaka's chapter refuses to treat both with the same reflex. To the over-full it says lighten; to the worn-out it says nourish. Getting that first fork right is half the cure, and getting it wrong — lightening someone already depleted, or nourishing someone already congested — makes things worse. The remaining four measures are refinements of these two instincts.

The Shad Upakrama (षड् उपक्रम): The Six Therapeutic Measures

The chapter opens with a definition of competence that is really a definition of the whole subject:

Notice the word timely. The skill is not in knowing that these measures exist — anyone can memorise a list of six. The skill is in matching the right measure to the right person at the right moment, and then stopping at the right point. The six measures, with their Sanskrit names, are:

• Langhana (लङ्घन) — lightening or reducing; anything that makes the body feel lighter.
• Brimhana (बृंहण) — nourishing or promoting; anything that builds and replenishes.
• Rukshana (रूक्षण) — roughening or drying; removing excess unctuousness and stickiness.
• Snehana (स्नेहन) — oleation; introducing healthy fats and softness (its own full chapter, Part 13).
• Swedana (स्वेदन) — sweating or fomentation; applying heat to loosen and mobilise (its own full chapter, Part 14).
• Stambhana (स्तम्भन) — checking or holding; stabilising and arresting an over-active flow.

The table below summarises how Charaka describes each measure. Read it as a map of the classical discussion — these are the indications the text itself lays out for scholars and physicians, not treatment claims for any product:

Two of these — snehana and swedana — are so important that Charaka gives them chapters of their own (which we have already covered as Parts 13 and 14). In Chapter 22 he simply places them in the larger family of six so the whole system can be seen at a glance.

Langhana (लङ्घन): The Lightening Therapy

Langhana is the measure that makes the body lighter. The Sanskrit root carries the sense of "crossing over" or "leaping" — the lightness a body feels when it is no longer weighed down. Crucially, Charaka does not equate langhana with a single technique like fasting. He lists a whole range of ways to achieve lightness:

Read that list again, because it is more sophisticated than the modern habit of equating "lightening" with skipping meals. Charaka offers a graded ladder. The gentlest rung is simply letting the body's own digestive fire do the work — pachana, digestive measures, and mild fasting. A step up is physical exercise and honest exposure to sun and wind, which lighten by moving and drying. Only the strongest forms involve therapeutic evacuation, which belongs firmly in a physician's hands.

The inclusion of digestive measures on that list is easy to skim past, but it points to something central in Ayurvedic thinking. Much of what feels like excess is really undigested residue — food and metabolic by-products the body never finished processing, which the texts call ama. Kindling the digestive fire so the body can finish that work is itself a form of lightening, and often the safest place to begin. It removes the burden without stripping away nourishment, which is why gentle digestive support sits so early on Charaka's ladder, well before fasting or evacuation.

Who is lightening therapy actually for? The chapter is specific. It matches the strength of the method to the strength of the person: the robust with disorders of moderate or little severity can be lightened with the vigorous methods — physical exercise and exposure to sun and wind — while gentler routes such as thirst and fasting suit others (Sutrasthana 22.19–24). Charaka also names groups who are classically suited to reducing therapy in sisira (late winter): those with skin disorders; those with prameha (the group of urinary and metabolic disorders the translators render as "diabetes"); those whose diet has been heavy, unctuous and channel-blocking; and certain Vata conditions (Sutrasthana 22.19–24). These are recorded here purely as the text's own scholarly discussion of who needs lightening and when — a matter for a qualified physician, never a self-prescription.

Brimhana (बृंहण): The Nourishing Therapy

If langhana takes away, brimhana gives. It is the nourishing, building, replenishing direction — the therapy for a body that has been worn thin rather than clogged up. Chapter 22 is unusually tender about who needs it:

It is a portrait of depletion that has not changed in two thousand years. The person run down by constant travel; the one who has burned the candle at both ends; the elderly, the convalescent, the naturally thin; and everyone in the heat of summer, when the text observes that strength naturally dips. To all of these, Ayurveda says: this is not the time to lighten further — this is the time to nourish.

What does classical nourishing look like? Charaka names a set of what he calls universal promoters:

Look closely at that list, because it dismantles a common misconception that Ayurvedic "nourishment" means only swallowing something. Half of it is behavioural: a warm bath, oil massage (abhyanga, the "anointing"), and adequate sleep are named as nourishing measures in exactly the same breath as milk and ghee. Rest and touch build the body as surely as food does. For those wasted by chronic depletion, the text also mentions light, easily-digested meat soups as a strong promoting food — recorded here as classical dietetics, part of the scholarly discussion of how the depleted were traditionally rebuilt (Sutrasthana 22.25–27).

There is also a warning folded into brimhana, and it is the mirror image of the langhana warning. Nourish correctly and, in the text's words, "one gets strength and corpulence and gives up the defects of the lean." Nourish to excess and "one suffers from obesity" (Sutrasthana 22.38). The goal of brimhana is not endless building; it is to restore what depletion took, and then to stop. This is the same balance Chapter 21 explored when it discussed the faulty conditions of both the over-heavy and the over-thin — the middle is always the target.

Placing langhana and brimhana side by side shows how completely they mirror each other — the same axis of health, approached from opposite ends:

Rukshana and Stambhana (रूक्षण, स्तम्भन): Roughening and Checking

The next two measures are the more specialised tools in the set. Rukshana (रूक्षण), roughening or drying therapy, is essentially a sharper, drier cousin of langhana. Where langhana lightens in general, rukshana specifically removes excess oiliness, stickiness and heaviness that is clinging where it should not. Charaka gives its indications precisely:

The mention of urustambha — a stiff, heavy immobility of the thighs — is a good example of how targeted these measures are. When channels are blocked by something dense and sticky, adding more oil (snehana) would deepen the problem; the correct direction is to dry and roughen. Recognising which is which is the physician's art.

Stambhana (स्तम्भन), the checking or holding therapy, is the sixth and in some ways the most distinctive measure. It is the tool for when something is flowing too much and needs to be stabilised and cooled. Charaka describes both its nature and its uses:

The logic is beautifully consistent with the first law of treatment. An over-active, hot, flowing state is met with its opposite qualities — cool, stable, astringent — so that similarity does not feed it and dissimilarity brings it down. Again, these are the classical indications the text itself discusses; they describe how ancient physicians reasoned, and are not claims that any modern product addresses these conditions.

Underlying all six of these measures is a single principle: a substance acts not because of its name but because of its qualities. It is worth pausing on that idea, because it is the engine that makes the whole system work — which is exactly where the chapter turns next.

Snehana and Swedana (स्नेहन, स्वेदन): Oleation and Sweating

The remaining two measures, snehana (स्नेहन) and swedana (स्वेदन), are so central to Ayurvedic practice that Charaka does not squeeze them into Chapter 22. Instead he places them in the family of six and points the reader onward: "Unction, persons suitable for unction, sweating and persons suitable for sweating are explained in their own chapters" (Sutrasthana 22.29–31). We have already walked through both of those chapters in this series.

Snehana is oleation — the therapeutic use of healthy fats, above all ghee and medicated oils, taken internally or applied externally. It belongs to the nourishing, moistening side of the family and is the classical answer to dryness, roughness and aggravated Vata. Chapter 22's own quality-analysis explains why: a substance that is "liquid... unctuous, slimy, heavy... soft" is oleating in effect (Sutrasthana 22.9–17). We devoted a full article to this in Part 13: Snehadhyaya, Oleation Therapy and the Four Healthy Fats.

Swedana is fomentation — the controlled application of heat and steam to loosen what is stiff, cold and stuck, and to open the channels so that other therapies can work. It sits on the lightening, mobilising side. Chapter 22 notes that a "hot, sharp, unstable... rough" substance is mostly sweating in effect (Sutrasthana 22.9–17). The full treatment is in Part 14: Swedadhyaya, Ayurveda's Heat Therapy.

Snehana and swedana also work as a famous pair: oil first, then heat. Together they form the standard purvakarma — the preparation that softens and mobilises the body before the deep cleansing procedures of Panchakarma. Seen through the lens of Chapter 22, this pairing is simply two of the six measures used in sequence: nourish and soften, then mobilise.

Gunas (गुण): The Qualities That Power Every Therapy

Behind all six measures sits Ayurveda's deepest piece of engineering: nothing acts because of its name; everything acts because of its qualities (gunas — गुण). Cold, hot, heavy, light, dry, oily, sharp, dull, stable, mobile — these are the real levers of change. A therapy works when its qualities are the opposite of the imbalance it meets, and worsens things when its qualities merely echo what is already in excess. Chapter 22 makes this concrete by describing, quality by quality, what sort of substance produces which effect:

At first glance this reads like a dry inventory. Look again and a pattern appears. Oleating (uncting) qualities are the heavy, cold, soft, slimy ones — everything you would associate with ghee. Sweating qualities are the hot, sharp, mobile ones — everything you would associate with steam. Checking qualities are the cold, stable, light ones that hold and settle. The table below lays out the core of each profile:

Taste (rasa) is folded into the same logic. Chapter 22 notes that the checking therapy is carried by substances that are not only cool and stable but also sweet, bitter and astringent in taste (Sutrasthana 22.32–33) — the very tastes that, as Chapter 1 taught, cool and settle rather than heat and stir. Qualities and tastes are two views of the same underlying reality.

This is why Ayurveda never reduced to a lookup table of "herb X for problem Y." A physician trained on Chapter 22 reads the qualities of the person's imbalance — is it heavy or light, hot or cold, wet or dry? — and then reaches for a measure whose qualities point the opposite way. The six measures are simply the six most useful directions in that quality-space: lighten, nourish, dry, moisten, heat, cool-and-hold. Master the qualities and you are no longer following recipes; you are reasoning the way the text intends.

Getting the Dose Right: Signs of Proper and Excessive Therapy

Here is where Chapter 22 becomes genuinely wise. A lesser text would list the six measures and stop. Charaka goes further and asks: how do you know a therapy is working, and how do you know you have gone too far? He answers with clear, observable signs — because in Ayurveda the patient's response, not the clock, tells you when to stop.

For lightening therapy done correctly, the signs are a pleasure to read. There is clearing of the throat and mouth, the disappearance of drowsiness and exhaustion, the appearance of light sweat, a return of relish for food, "both hunger and thirst together," and an overall feeling of well-being (Sutrasthana 22.34–37). That phrase — hunger and thirst returning together — is a small masterpiece of clinical observation: it is the body signalling that its digestive fire has rekindled and it is ready to receive again.

Push lightening too far, and the picture inverts:

This is the ancient description of a body lightened past the point of benefit — the difference between feeling clean and feeling depleted. Charaka adds that the signs of proper and excessive roughening therapy are the same as those for reducing (Sutrasthana 22.38), since the two belong to the same lightening family.

Checking therapy has its own pair of signals. It is "regarded as properly administered when the disorders are overcome and strength is gained." Applied to excess, it afflicts the person with "blackishness, stiffness in body parts, uneasiness, lockjaw, and obstruction" of normal functions (Sutrasthana 22.39–40). And nourishing therapy, as we saw, is proper when it restores strength and shape, and excessive when it tips into obesity (Sutrasthana 22.38).

There is a reason Charaka leans on signs rather than fixed durations. Two people given the identical therapy will reach the correct endpoint at different moments, because they begin from different constitutions, different strengths and different degrees of imbalance. A robust person may need a longer, firmer application; a frailer one may reach the same benefit far sooner and be harmed by pressing on. By teaching the physician to read the body's response — the returning appetite, the lightness, the sense of ease, or on the other hand the new aches and low spirits — the chapter builds a self-correcting system. The patient's body, not a fixed protocol, calls time.

Charaka then states the universal test that governs all six: a therapy is "not adequately administered" when the treated doshas "are not pacified rather are aggravated" (Sutrasthana 22.41–42). The measure of success is never how much therapy was applied — it is whether balance was actually restored.

It is an elegant closing thought. Just as every imbalance in the body, however complex, is ultimately some combination of three doshas, every treatment, however elaborate, is ultimately some combination of these six measures. Three causes, six cures. The whole of Ayurvedic therapeutics fits in one hand.

Living Chapter 22 Today

You do not need to be a physician to put Chapter 22 to work. Its deepest lesson is a single habit of mind: before reaching for any remedy, ask which direction your body needs to move. Here is the chapter distilled into practical principles:

• Diagnose the direction first. Feeling heavy, sluggish, congested, coated? That is a call to lighten. Feeling drained, thin, shaky, worn out? That is a call to nourish. Getting the direction right matters more than any single technique (Su 22.3–8).
• Use the gentlest tool that works. Charaka lists many roads to lightness — a lighter meal, a real walk, honest sun and air, waiting for true hunger — long before anything drastic (Su 22.18). Start gentle.
• Nourish with more than food. A warm bath, oil massage and proper sleep are named as nourishing measures alongside milk and ghee. Rest is medicine for the depleted (Su 22.28).
• Match the season. Late winter leans toward lightening; summer, when strength dips, leans toward gentle nourishing (Su 22.19–28).
• Watch for the "too far" signs. Returning hunger, lightness and well-being mean you are on track; new aches, dryness, weakness and low mood mean you have overshot (Su 22.34–37).

The nourishing (brimhana) direction is also where Ayurveda's Rasayana tradition lives — the classical tonics taken not to fix a problem but to replenish and sustain, especially for those worn thin by modern life's version of "constant travel on foot."

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