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For information about the book Charaka Samhita, see Charaka Samhita.

Charaka, sometimes spelled Caraka, (born c. 300 BC) was one of the founders of Ayurveda, a system of medicine developed in Ancient India. According to Charaka, health and disease are not predetermined and life may be prolonged by human effort.

The following statements are attributed to Charaka:

A physician who fails to enter the body of a patient with the lamp of knowledge and understanding can never treat diseases. He should first study all the factors, including environment, which influence a patient's disease, and then prescribe treatment. It is more important to prevent the occurrence of disease than to seek a cure.

These remarks appear rudimentary today, but they were made by Charaka, in his famous Ayurvedic treatise Charakasamhita. The treatise contains many more such remarks which are held in reverence even today. Some of them are in the fields of physiology, etiology and embryology.

Charaka was the first physician to present the concept of digestion, metabolism and immunity. According to him a body functions because it contains three dosha or humours, namely, bile, phlegm and wind. These dosha are produced when dhatus (blood, flesh and marrow) act upon the food eaten. For the same quantity of food eaten, one body, however, produces dosha in an amount different from another body. That is why one body is different from another. For instance, it is more weighty, stronger, more energetic.

Further, illness is caused when the balance among the three dosha in a human body is disturbed. To restore the balance he prescribed medicinal drugs. Although he was aware of germs in the body, he did not give them any importance.

Charaka knew the fundamentals of genetics. For instance, he knew the factors determining the sex of a child. Agenetic defect in a child, like lameness or blindness, he said, was not due to any defect in the mother or the father, but in the ovum or sperm of the parents (an accepted fact today).

Charaka studied the anatomy of the human body and various organs. He gave 360 as the total number of bones, including teeth, present in the body. He wrongly believed that the heart had one cavity, but he was right when he considered it to be a controlling centre. He claimed that the heart was connected to the entire body through 13 main channels. Apart from these channels, there were countless other ones of varying sizes which supplied not only nutrients to various tissues but also provided passage to waste products. He also claimed that any obstruction in the main channels led to a disease or deformity in the body.

Under the guidance of the ancient physician Atreya, Agnivesa had written an encyclopedic treatise in the eighth century B.C. However, it was only when Charaka revised this treatise that it gained popularity and came to be known as Charakasamhita. For two millennia it remained a standard work on the subject and was translated into many foreign languages, including Arabic and Latin.

According to the Charaka tradition, there existed six schools of medicine, founded by the disciples of the sage Punarvasu Ātreya. Each of his disciples, Agnivesha, Bhela, Jatūkarna, Parāshara, Hārīta, and Kshārapāni, composed a Samhitā. Of these, the one composed by Agnivesha was considered the best. The Agnivesha Samhitā was later revised by Charaka and it came to be known as Charaka Samhitā. The Charaka Samhitā was revised by Dridhbala.

Āyurveda is traditionally divided into eight branches which, in Charaka's scheme, are:

1. Sūtra-Sthāna, general principles
2. Nidāna-Sthāna, pathology
3. Vimāna-Sthāna, diagnostics
4. Sharīra-Sthāna, physiology and anatomy
5. Indriya-Sthāna, prognosis
6. Chikitsā-Sthāna, therapeutics
7. Kalpa-Sthāna, pharmacy
8. Siddhi-Sthāna, successful treatment

The Charak Samhita contains 120 adhyayas (chapters), divided into 8 parts.

1. Sutra Sthana
2. Nidan Sthana
3. Viman Sthana
4. Sharir Sthana
5. Indriya Sthana
6. Chikitsa Sthana
7. Kalpa Sthana
8. Siddhi Sthana