Vis medicatrix naturae

Vis medicatrix naturae (literally "the healing power of nature", and also known as natura medica) is the Latin rendering of the Greek Νόσων φύσεις ἰητροί ("Nature is the physician(s) of diseases"), a phrase attributed to Hippocrates. While the phrase is not actually attested in his corpus, it nevertheless sums up one of the guiding principles of Hippocratic medicine, which is that organisms left alone can often heal themselves (cf. the Hippocratic primum non nocere).

Hippocrates believed that an organism is not passive to injuries or disease, but rebalances itself to counteract them. The state of illness, therefore, is not a malady but an effort of the body to overcome a disturbed equilibrium. It is this capacity of organisms to correct imbalances that distinguishes them from non-living matter.

From this follows the medical approach that “nature is the best physician” or “nature is the healer of disease”. To do this Hippocrates considered a doctor’s chief aim was to help this natural tendency of the body by observing its action, removing obstacles to its action, and thus allow an organism to recover its own health. This underlies such Hippocratic practices as blood letting in which a perceived excess of a humor is removed, and thus was taken to help the rebalancing of the body's humors.

After Hippocrates, the idea of vis medicatrix naturae continued to play a key role in medicine. In the early Renaissance, the physician and early scientist Paracelsus had the idea of “inherent balsam”. Thomas Sydenham, in the 18th century considered fever as a healing force of nature.

In the nineteenth-century, vis medicatrix naturae came to be interpreted as vitalism, and in this form it came to underlie the philosophical framework of homeopathy, chiropractic, hydropathy, osteopathy and naturopathy. As Bynum notes, "Search the Internet for vis medicatrix naturae and you will find yourself in the land of what we now politely call 'alternative' or 'complementary' medicine".

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