What is the Sutrasthana?

The Charaka Samhita — the foundational text of Ayurvedic internal medicine — is organised into **eight sections (sthanas), comprising 120 chapters. The first section is called the Sutrasthana** ("Section of Aphorisms") and contains the theoretical foundations of Ayurveda.

        ┌─────────────────────────────────────────┐
        │       CHARAKA SAMHITA STRUCTURE         │
        ├──────────────────┬──────────────────────┤
        │ 1. Sutrasthana   │  30 chapters         │
        │    (Aphorisms)   │  — fundamentals      │
        │ 2. Nidanasthana  │  Causes of disease   │
        │ 3. Vimanasthana  │  Specific topics     │
        │ 4. Sharirasthana │  Anatomy, embryology │
        │ 5. Indriyasthana │  Prognosis           │
        │ 6. Chikitsasthana│  Treatment           │
        │ 7. Kalpasthana   │  Formulations        │
        │ 8. Siddhisthana  │  Panchakarma         │
        └──────────────────┴──────────────────────┘

Key Concepts from the Sutrasthana

Excerpt 1 — Definition of Ayurveda (Chapter 1, "Dirghamjivitiyam")

"Hitahitam sukham duhkham ayustasya hitahitam, Manam cha tachcha yatra ukto Ayurvedah sa uchyate." "That which deals with what is beneficial and what is harmful for life, what is conducive to happiness and what causes misery, the measure of life, and the means of attaining all these — that is called Ayurveda."

This single verse defines Ayurveda not merely as medicine but as a science of healthy living.

Excerpt 2 — The Trisutra of Charaka

Charaka frames the entire discipline in three foundational concerns:

        ┌─────────────────────────────────────────┐
        │         TRISUTRA (Three Pillars)        │
        ├──────────────────┬──────────────────────┤
        │ 1. Hetu   │  Cause of disease           │
        │ 2. Linga  │  Symptoms / signs           │
        │ 3. Aushadha │ Medicine / treatment       │
        └─────────────────────────────────────────┘

This is the ancestor of the modern etiology — symptomatology — therapeutics triad.

Excerpt 3 — The Trividha Pariksha (Three Methods of Examination)

A patient must be examined through three independent methods:

Excerpt 4 — Dinacharya (Daily Regimen, Ch. 5)

Charaka prescribes a precise daily routine to maintain health:

     ⏰ Brahmamuhurta (~4:30 AM)  →  Wake before sunrise
     ⏰ Mukha-prakshalana          →  Cleanse face, eyes
     ⏰ Danta-dhavana              →  Brush teeth (with neem/babul twigs)
     ⏰ Jihva-nirlekhana           →  Tongue scraping
     ⏰ Anjana                     →  Apply collyrium to eyes
     ⏰ Nasya                      →  Nasal drops (medicated oil)
     ⏰ Gandusha                   →  Oil pulling (mouth)
     ⏰ Abhyanga                   →  Self-massage with warm oil
     ⏰ Vyayama                    →  Exercise (to half capacity)
     ⏰ Udvartana                  →  Dry powder massage
     ⏰ Snana                      →  Bath
     ⏰ Bhojana                    →  Meal (at sun's peak)

Notice how this aligns with modern circadian-rhythm research validating the benefits of early rising, oral hygiene, exercise, and timed meals.

Excerpt 5 — The Three Pillars of Life (Tri-Upastambha, Ch. 11)

"Tri Upastambhah Ahara Nidra Brahmacharyam iti." Three supports of life: Diet, Sleep, and Right use of vital energy.

Without these, says Charaka, even the strongest medicines cannot heal.

Excerpt 6 — Causes of Disease (Mithya-yoga, Ati-yoga, A-yoga)

All disease, says Charaka, ultimately stems from three errors in our relationship with time, intellect, and sensory objects:

This applies to senses, mental activity, and physical actions.

Excerpt 7 — Sadvritta (Code of Right Conduct)

Charaka prescribes ethical and social conduct (sadvritta) as part of preventive medicine:

• Respect elders, teachers, and the unfortunate.
• Speak truth that is also pleasant; avoid harsh truth and pleasant lies.
• Maintain cleanliness in body, clothing, and surroundings.
• Avoid jealousy, anger, greed, attachment, and pride.
• Eat only after one's previous meal is digested.

Excerpt 8 — Definition of a Good Physician (Vaidya Vritti)

"Saviparyaschaiva Yo vetti Vidyam paryushitamiva, Sa vaidyo nopayoktavya iti." He who knows medicine only by rote, without understanding context and rationale, is not a true physician — even his medicine is stale.

Charaka's ideal physician possesses shastra (knowledge), vijnana (wisdom), dhairya (courage), and karma-darshitvam (practical experience).

Why Read the Sutrasthana Today?

The Sutrasthana is not just a historical document — it is a manual for the philosophy of medicine. Its emphasis on patient-centred, preventive, and ethical practice resonates strongly with current concerns in healthcare like burnout, over-treatment, and patient autonomy.