Sitali breathing (sitali pranayama): the cooling breath

Sitali is a pranayama breath in which you inhale through a curled tongue or the teeth — used traditionally when you feel physically or emotionally hot.

Why it works

Sitali (also written shitali, from a Sanskrit root meaning cooling) is a classical pranayama technique described in hatha yoga texts including the Hatha Yoga Pradipika. Its distinguishing feature is the inhale route: air is drawn across the wet surface of a lengthwise-curled tongue, or between the teeth in the variant called sitkari, and exhaled through the nose. The proposed mechanism is straightforward but only partly tested. Evaporative cooling over the moist tongue lowers the temperature of the incoming airstream, which is directly perceptible and stimulates cold-sensitive receptors in the mouth and pharynx — the sensation itself is real and immediate. Whether that produces a meaningful change in core temperature or autonomic state is not established. What is better supported is the more mundane part: sitali enforces a slow, lengthened inhale followed by a longer nasal exhale, and slow breathing with a prolonged exhale is the pattern with the strongest evidence for shifting toward parasympathetic dominance. The cooling framing may be doing less work than the breath ratio it obliges.

How to do it

1. Curl the tongue lengthwise (a genetic ability; if you cannot curl your tongue, perform sitkari — inhale through the teeth with a slight hiss).
2. Inhale slowly through the curled tongue for 4–6 counts, feeling the cool air.
3. Close the mouth and exhale through the nose for 6–8 counts.
4. Repeat 8–10 rounds.
5. Best done in warm environments or when you feel physically hot or emotionally "heated."

Evidence

Sitali is described in classical pranayama texts as a cooling practice; the thermal receptor mechanism is physiologically plausible. Controlled research on sitali specifically is very limited. The extended inhale-and-exhale pattern shares evidence with other slow-breathing work. (mechanistic)

Very little independent peer-reviewed research targets sitali as an isolated practice. Its benefits are plausible from mechanism but not directly demonstrated in controlled trials. Avoid in cold, dry, or polluted environments where cool, unfiltered air is not desirable.

Common mistake

Practicing sitali in cold weather — the practice is specifically for internal and environmental heat; inhaling cold, dry air through the mouth without nasal warming can irritate airways.