About Samuel Hahnemann
Pillars of Homeopathy
Cardinal Principles
How It Works
Cardinal Pricipals

Every science is based on certain principles and the same holds true for the Homoeopathic science too. There are a few solid, fundamental principles, which form the basis of this great science. It has its own unique philosophy and therapeutics that are founded on seven cardinal principles.
They are as follows:

1. Law of Similia
2. Law of Simplex
3. Law of Minimum
4. Doctrine of Drug Proving
5. Theory of Chronic Diseases
6. Theory of Vital Force
7. Doctrine of Drug Dynamisation

Let us consider each of these principles in detail to have a better perspective of the Homoeopathic system of medicine.

Law of Similia

Some like Hippocrates and Paracelsus knew this Law of Similars even before Hahnemann rediscovered it and founded a whole system of therapeutics based on it. Hahnemann distinctly declares that the phenomenon of cure entirely depends upon this law. In other words, this is the law that governs Homoeopathy and forms the most fundamental basis of this science.

The word 'homoios' means 'like' or 'similar' and 'pathos' means 'suffering' and so Homoeopathy is a 'Medicine of likes'. It is a method of curing the sufferings in a diseased individual by administration of remedies that have the capacity to produce similar sufferings in a relatively healthy individual (by symptom similarity).

Thus Hahnemann derived the Law of Similia based on this principle, and has stated it in the aphorism number 26 in the book, Organon of medicine, which reads as follows :

"A weaker dynamic affection is permanently extinguished in the living organism by a stronger one, if the latter (whilst differing in kind) is very similar to the former in its manifestations."

By this he means, that each individual case of disease is most surely, radically, rapidly and permanently annihilated and cured if the symptoms of the medicine chosen (without it being of the same species) are similar to the disease symptoms but superior to it in strength.

This law is also called as SIMILIA SIMILIBUS CURANTUR, which means 'Let likes be treated by likes' (like cures like). By this law, he wants to emphasize that, in order to execute a cure and heal an ailing person, a homoeopathic physician needs to administer a drug that produces symptoms that are similar to the diseased symptoms.

This law can be prominently seen in nature too :
'Illumination of a candle (weaker in nature) is completely out shadowed by the brilliant light of the sun (stronger in nature and differing in kind)'

Law of Simplex

Hahnemann states in aphorisms 272-274, 'Only one, single, simple remedy should be administered to the patient at one time'. This is the law of simplex.

He further explains this in a simplified manner as :

  • At any given time, only one remedy can be the exact similar to the presenting disease condition of the patient.
  • During drug proving, drugs are proved singly and the symptoms then observed are compiled into the Materia Medica.
  • If the physician administers more than one remedy at a time, he will be unable to ascertain the curative action of the remedy.
  • Administration of more than one remedy can produce certain group of symptoms, which can be harmful to the patient.

Law of Minimum

The curative effect of the medicine does not depend only on the selection of a similar remedy but also on the quantity of the medicine. Since the homoeopathic medicines act at a dynamic level, only a minute quantity of the medicine is enough to stimulate the dynamically deranged vital force to bring about the necessary curative change in a patient.

This quantitative reduction of the medicinal substance is achieved by the method of potentisation, which avoids the unwanted medicinal aggravation caused by crude substances, and prevents chances of any organ damage.

A French mathematician, Maupertius, also observed this same principle and stated, 'The quantity of action necessary to affect any change in the nature is the least possible, an infinitesimal'.
(Refer- Principles and art and cure by Roberts)

Doctrine of Drug Proving

Drug proving is a systemic investigation and evaluation of the disease producing power of a substance on healthy human beings of sexes, different age groups and people from different places.

In drug proving, a drug or a medicine is administered to a group of relatively healthy individuals (provers) until symptoms of ill health and disease appear in them. These provers are instructed to carefully observe and note all finer sensations, feelings and emotions, or any subtle deviations in the normal functioning of the various organs and parts of the body.

After the proving is concluded, symptoms reported by the provers are carefully assessed, evaluated, classified and grouped according to the part of the body affected and degree of severity. The end result of this work is compiled in a systematic order and the 'Materia Medica' of the proved drug is created. This drug can be administered as a curative remedy to an ailing person when he presents with a similar set of symptoms. Only well proved remedies are used to prescribe for the patients. Various sources must be explored and proved in order to understand their curative properties and added to the bulk of the already existing Materia Medica.

It is a prerequisite, to choose healthy individuals for conducting a drug proving, because if a diseased person is chosen, the symptoms of the drug to be proved and the disease symptoms will merge with each other and an accurate picture of the drug will not emerge.

Drug proving also needs to be done exclusively on human beings as they can describe subjective sensations and feelings precisely and in detail. Only humans have the intelligence to appreciate and record subjective symptoms as deviations from their normal conditions of life. They can describe the exact location and the precise sensations of their physical symptoms and explain factors, which lessen or worsen their complaints. They are capable of giving a vivid picture of the mental state in the course of the proving and can also describe their dreams, which denote the subconscious mind.

The subjective mental and physical symptoms thus obtained are of great prescriptive value. These things can only be elicited by proving carried out on humans and can never be elicited in a proving conducted on animals as they have not been bestowed with the intelligence to perceive, and capability to communicate in the way a human can.

E.g. Proving of Arnica - Encyclopedia of Pure Materia Medica, vol. 1 by Allen T.F

After1 hour -
Feeling as of one ear being hot, which, however, was not the case

After 11/2 hours -
Frightfulness, unexpected trifles frighten and cause him to start

After 3 hours -
Distension of the bowels, with frequent urging to stool
Flatus smells like rotten eggs
Ringing in the left ear
Sharp thrusts through the abdomen from one side to the other

After 4 hours -
Obstinate and headstrong resistance to other people's opinions
The head feels heavy, and is so movable on account of weakness of the muscles of the neck, that it easily inclines to all sides

After 7 hours -
Violent stitches in the forehead when coughing

After 8 hours -
When walking in the open air, sensation of heaviness and pressure in the muscles under the articulations of the upper and lower extremities

After 10 hours -
Violent stitches in the head when coughing; headache with stitches extending upwards; they come on again when coughing or moving the head, can only be relieved by resting the head upon painful side.

After 3 and 12 hours -
He is contradictory; nothing can be done to suit him

After 14 hours -
Nausea and disposition to vomit early in the morning

After 24 hours -
Dry heat in the face, towards evening, extending as far as behind the ears, without any thirst, the nose being quite cold
Violent cutting in the left side of the abdomen, which darted upwards like a stitch as far as the vertex, so that he jumped up as from an electric spark
Pain, as from bruises, in the articulation of the right jaw, when moving the jaw to and fro, early in the morning

After 27 hours -
Drawing pain in the right eyeball

After 30 hours -
Sensibly diminished hearing

After 36 hours -
Hard, difficult, with pressure in the abdomen

After 48 hours -
Nightly thirst

After 60 hours -
Pain in loins, cutting from without inwards, especially when stooping

The first four days -
Frequent emission of white watery urine, the quantity of which is smaller than the liquid, which he had drunk; the last drops of the urine do not press out easily.........and in this manner the proving is recorded.

Theory of Chronic Diseases

After 30 years of homoeopathic practice Dr.Hahnemann realized that homeopathy failed to execute a 'real cure' in some diseases. He observed that in many cases symptoms got ameliorated for a brief period only to relapse at a later date. This intrigued him and made him reflect as to the possible cause of these failures. The following were the probable causes that were considered....

  • The Law of Similars might not be universally applicable
  • There could be some flaw in the application of the Law of Similars
  • The number of drugs till date were inadequate to cover all the diseases
  • There could be some error in determining the totality of symptoms
  • There might be some obstacles that persisted, which hindered cure

Hahnemann, by his reasoning and logic, excluded the other probabilities and concluded that certain obstacles were responsible for the relapses and failures. So he studied the chronic cases in great depth and after 12 years of studies, he discovered that chronic diseases are caused by chronic miasms.

Miasm is an obnoxious disease-producing agent, dynamic in nature and inimical to life. He founded the theory of miasms and named the miasms as :

  • Psora
  • Sycosis
  • Syphilis


Psora is the mother of all chronic diseases and almost 80% of chronic diseases come under its domain. It is an internal disease, which may exist with or without an eruption on skin. It is the fostering soil for every possible disease condition. Hahnemann realized that psora is not a local skin disease, but a manifestation of an internal disorder of unhealthiness and should never be treated by external remedies. Unless it is thoroughly cured, it persists till the last breath of life.

Psoric personalities are mentally active, quick, alert, but easily prostrated from exertion, both mental and physical. They are very anxious and fear death, that health will fail, of being unable to succeed. Ill-effects from strong emotions grief, fear, etc. Physical manifestations are in the form of itch, skin eruptions etc. Sycosis & Syphilis follows Psora.
Remedies : Psorinum, Sulphur


Sycosis is generally understood to be the gonorrheal poison but gonorrhea is an acute gonococcal infection that develops after an exposure, while Sycosis is established after a suppressed gonorrhea when the acute infection is driven in upon the vital energy by external methods of suppression making a systematic stigma that permeates every cell of the living organism.

Sycotic personalities are highly suspicious, jealous, vindictive and quarrelsome. They have fixity and rigidity of thoughts. Physical manifestations are seen in the form of warts, gonorrhea etc.
Remedies : Thuja, Medorrhinum


Syphilis is comparatively a modern disease, which occurs through sexual contact. It presents as chancre, and with discharging eruptions on the genitals. Whereas the miasm Syphilis is a lethal poison which when once driven inside or suppressed, starts eating into the system destroying tissues and altering the structure of bones, ligaments etc. Long standing Psora or Sycosis can lead to Syphilis where the manifestations are destructive. There is a chronic desperate struggle to survive, which is similarly seen even at the level of mind.

Syphilitic personalities are hopeless, violent, sadists, criminals and anti-social. The person is slow of comprehension, sullen, stupid, easily angered. The breaking out of an ulcer or hemorrhages relieves mental troubles. Physical manifestations are seen in the form of ulcerations, induration, caries etc. Also, there is marked nightly aggravation of all complaints.
Remedies : Syphilinum, Merc-sol

Theory of Vital Force

Vital force is the invisible vital energy that animates each organism and is the most intimate spark, the essence of the individual. The material organism (body), without the vital force is capable of no sensation, no function, no self-preservation; it derives all sensations and performs all the functions of life solely by means of the immaterial being (vital force), which animates the material organism in health and in disease. In health it is this spirit-like force that governs the life and maintains all the bodily sensations and functions in equilibrium.

When a person falls ill it is only this spiritual, self-acting (automatic) vital force, everywhere present in his organism, which is primarily deranged by the dynamic influence upon it of a morbific (disease causing) agent inimical to life. It is only the vital force, deranged to such an abnormal state, which can furnish the organism with its disagreeable sensations and incline it to the irregular processes, which we call disease.

Hence in disease, there is dynamic derangement of the vital force, which leads to disharmony and alteration of all the bodily functions and sensations. Hahnemann has described about this vital force in the Organon of medicine in aphorism 9 and 10 as follows :

'In the healthy condition of man, the spiritual vital force (autocracy), the dynamis that animates the material body (organism), rules with unbounded sway, and retains all the parts of the organism in admirable, harmonious, vital operation, as regards both sensations and functions, so that our indwelling, reason-gifted mind can freely employ this living, healthy instrument for the higher purposes of our existence'.

'The material organism without the vital force is capable of no sensation, no function, no self preservation; it derives all sensations & performs all functions of life solely by means of the immaterial being - the vital force which stimulates the organism in health and disease'.

Doctrine of Drug Dynamisation

Hahnemann began the experiments of the application of proven drugs for the cure of the sick upon the basis of the law of similars, by using drugs in their full strength but many a times, he observed aggravation of the ailments in patients. He reasoned that the dose was too large and hence started diluting the drug on a definite scale .He found to his surprise that the results obtained were much better. He continued this process of dilution until he discovered that the curative power of drugs bore no proportionate relationship to the crude quantity, but by this peculiar and systematic method of dilution based on a regular scale, the concealed curative powers of otherwise inert substances were extracted. He named this process of drug dynamization as 'Potentisation'. Potentisation is a process by which all the medicinal properties, which are latent in a substance, are extracted from their crude form for the curative purpose.

There are two methods of potentisation; Trituration for insoluble substances and Sucussion for soluble ones.

Benefits of potentisation

  • Substances, which are medicinally inert in their crude form, are made available for the curative purpose.
  • The action of the potentised medicines is deeper, longer and curative.
  • Toxic materials and venoms of certain animals when potentised are rendered harmless for therapeutic purpose
  • The medicinal power increases dynamically by the process of potentisation, hence these medicines are able to stimulate the (dynamically) deranged vital force and restore the state of health.
  • By potentisation, there is a quantitative reduction and a qualitative enhancement of the medicinal substance, hence medicinal aggravation is minimized.

In drug proving, when a drug is administered in a high potency, the symptoms obtained are more accurate and finer, more so at the level of mind.