Homeopaths believe that good health derives from an equilibrium between the mind and body, which is maintained by a “vital force” that regulates the body’s self-healing capabilities.
The vitalistic concept of science had existed for many years by the time Hahnemann was developing his theories. It claims that all living things possess a subtle energy beyond their physical and chemical states, and that even inanimate matter may contain vitality.
Thus the vital force of any plant, mineral, or animal could be harnessed to produce a powerful medicine when “potentized”. Hahnemann viewed ill-health as the result of an internal imbalance affecting the body’s vital force and disrupting its equilibrium. If this vital force is put under strain or weakened by this imbalance, illness may develop. In stimulating the body’s self-healing abilities to fight any imbalance, the vital force produces symptoms. These may manifest externally, producing such symptoms as fever or a skin rash, or may emerge as emotional or psychological states, such as weepiness or great irritability. An effective medicine must help the vital force to redress the internal imbalance, enabling the symptoms produced by that imbalance to disappear, and this is what homeopaths seek to achieve.
Hahnemann adopted the principle of similia similibus curentur, or “like cures like”, first established in the 5th century BCE by Hippocrates. His “provings” of remedies aimed to establish the particular set of symptoms, or “symptom picture”, produced by taking a substance. When the symptom picture matched the particular set of symptoms produced by an illness or imbalance in a patient, that remedy was indicated as the most effective at stimulating the vital force to treat the disorder. The key was – and in classical homeopathy still is – to establish which remedy most exactly matches a patient’s symptom picture.
For example, Hahnemann’s initial experiments were with Cinchona bark, from which quinine is derived. He found that if it is given in daily doses to a healthy person it can cause symptoms similar to malaria. Indeed, this same Cinchona is curative in many patients with malaria.
There are many examples of this principle of “like cures like.” Everyone knows how coffee keeps people awake and alert. In homeopathy it is used in very small doses to cure patients with just that same kind of insomnia associated with an overly alert mind.
Many of the substances from which remedies are made are highly potent or possibly even poisonous. Hahnemann used only “small doses” of substances in his medicines, but to his consternation his patients still tended to suffer side-effects, or “aggravations”, as he called them. He developed a technique called “potentization”, which involved diluting and shaking the medicine vigorously or banging it on a hard surface during preparation. This turbulent motion, which Hahnemann called “succussion”, apparently released more potency into the medicine, even at lower dilutions. To Hahnemann’s surprise, his research showed that microdilutions prepared with the additional turbulent energy provided by potentization seemed to have a much stronger effect than standard dilutions, providing a rapid and gentle effect that was long lasting.

This was the cultural and scientific milieu in which the German doctor Samuel Christian Hahnemann (1755–1843) began practicing in 1780. He continued in practice for nine years, during which time he became increasingly disillusioned with the harsh medical methods of the day. In articles written to supplement his income, Hahnemann attacked the extreme medical practices of the day, advocating instead good public hygiene, improved housing conditions, better nutrition, fresh air, and exercise.