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Brihat Trayi, the Great Triad

Charaka Samhita

चरक संहिताalso written Charak Sanhita

The foundational text of Ayurvedic internal medicine, and the source of much of what we call daily-routine wisdom today.

Era

Core c. 2nd century BCE, completed by the 4th century CE

Author

Agnivesha, redacted by Charaka, completed by Dridhabala

Scope

120 chapters across 8 sections (sthanas)

Brihat Trayi
चरक संहिताCharaka Samhita
c. 150 BCE
Where it comes from

Ayurveda's own story traces this knowledge from Brahma to Daksha Prajapati to the Ashwini twins to Indra, and finally to the sage Bharadvaja, who brought it to the world of physicians. From Atreya Punarvasu it passed to his disciples, and Agnivesha wrote it down most completely.

Whatever one makes of the mythic frame, the historical text is a compilation refined over many hands and centuries. That is its strength: it is not one person's opinion but the settled, tested understanding of a long tradition, argued out in the form of teacher-student dialogue.

Why it matters

A foundation, not a footnote.

The Charaka Samhita is the definitive classical text of kayachikitsa, internal medicine, and the foundational member of the three great texts (the Brihat Trayi). If Ayurveda has a single foundation stone, this is it.

It is remarkable for its emphasis on prevention over cure. Long before the phrase existed, Charaka insisted that the physician's first duty is to keep the healthy person healthy, through diet, daily routine (dinacharya), seasonal routine (ritucharya), and conduct. That preventive, ritual-first spirit is exactly the Ayurveda we practise every morning.

It also lays down a strikingly modern ethics of medicine, a code of conduct for the physician, and the earliest known framework of debate, logic, and clinical reasoning in Indian medicine.

How it is built

120 chapters across 8 sections (sthanas)

The text is organised into eight sthanas (sections), each handling one dimension of medicine, from first principles to practical treatment.

01

Sutra Sthana

General principles: diet, drugs, daily and seasonal routine, and the definition of health. 30 chapters.

02

Nidana Sthana

The causes and diagnosis of major diseases. 8 chapters.

03

Vimana Sthana

Measurement and method: pathology, ethics, and clinical training. 8 chapters.

04

Sharira Sthana

The body and the self: anatomy, embryology, and philosophy. 8 chapters.

05

Indriya Sthana

Signs, symptoms, and prognosis. 12 chapters.

06

Chikitsa Sthana

Treatment, the largest section, including rasayana (rejuvenation). 30 chapters.

07

Kalpa Sthana

Pharmacy and the preparation of formulations. 12 chapters.

08

Siddhi Sthana

The successful use of purification therapies (panchakarma). 12 chapters.

What is inside

The Charaka Samhita covers the whole of a physician's world. It opens not with disease but with health: what to eat, when to sleep, how to move through the day and the seasons, and how a steady routine protects the body before any medicine is needed.

From there it builds outward, the three doshas and their balance, the digestive fire (agni) as the root of health, the seven tissues (dhatus), the causes of illness, the reading of signs, and finally treatment, from gentle diet and lifestyle correction to herbal formulations and panchakarma.

Woven through all of it is a philosophy: that a human being is a small mirror of the universe, and that health is harmony between the two. Medicine, for Charaka, is not just fixing what breaks but living in a way that rarely breaks at all.

Notable for

  • The oldest and most complete classical text on internal medicine
  • The origin of the dinacharya (daily routine) and ritucharya (seasonal routine) we still follow
  • An early, explicit ethics and code of conduct for physicians
  • The foundational account of the three doshas, agni, and the dhatus
  • Prevention placed above cure, centuries before modern preventive medicine

Ancient text, everyday ritual

This is where your rituals come from.

Almost every ritual on this site has a root in the Charaka Samhita. When we say eat your main meal at midday, oil your body before a bath, or keep a steady wake time, we are quoting, in plain words, what Charaka set down two thousand years ago.

That is why the rituals work: they are not wellness trends, they are the distilled, tested observations of a tradition that watched human bodies for centuries. Reading the source is how a ritual stops being a rule you follow and becomes something you believe.

See the rituals in the Journal
The lineage

Where it sits in the canon.

From the Vedic age to the 1700s, each text built on the ones before it. Follow the thread.

  1. Composed and transmitted orally c. 1500 to 500 BCE, from far older rootsThe VedasThe pre-Samhita origin
  2. Ancient core traditionally placed around the 6th century BCE, redacted in the early centuries CESushruta SamhitaBrihat Trayi, the Great Triad
  3. Core c. 2nd century BCE, completed by the 4th century CECharaka Samhitayou are hereBrihat Trayi, the Great Triad
  4. c. 6th to 7th century CEAshtanga SangrahaVagbhata's greater synthesis
  5. c. 7th century CEAshtanga HridayaBrihat Trayi, the Great Triad
  6. Late 13th to early 14th century CESharangadhara SamhitaLaghu Trayi, the Lesser Triad
  7. Commonly placed around the 13th century CE (dating debated)Rasaratna SamuccayaRasashastra, Ayurvedic alchemy
  8. 16th century CEBhavaprakashaLaghu Trayi, the Lesser Triad
  9. c. late 17th century CEBhojanakutuhalaDietetics and culinary science (ahara)
  10. Commonly dated to the mid-17th century CE, often around 1676YogaratnakaraLater compendium (sangraha grantha)
Questions

Good to know

Who actually wrote the Charaka Samhita?+

It is a layered text. The original was composed by Agnivesha, a disciple of the sage Atreya Punarvasu; it was then redacted by the physician Charaka, and later completed by Dridhabala around the 4th century CE. It represents a lineage of teachers and students rather than a single author.

How old is it?+

Its core is usually dated to a few centuries BCE, with the final form settled by about the 4th century CE. Scholars place the main redaction around the 2nd century BCE to 2nd century CE, with older oral roots behind it.

What is the Charaka Samhita mainly about?+

Internal medicine (kayachikitsa), but it begins with health rather than disease: diet, daily and seasonal routine, the doshas, digestion, diagnosis, and treatment. Its guiding idea is prevention through right living.

Why does it matter for everyday life?+

Because the daily habits Ayurveda recommends, from morning routine to seasonal eating, are drawn straight from it. Understanding the source turns those habits from arbitrary rules into trusted, time-tested practice.

Read it in practice

From the source to your day.

Journal articles that quote or draw on the Charaka Samhita.

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