This section is from the book "A Compend Of The Principles Of Homoeopathy", by William Boericke. Also available from Amazon: A Compend of the Principles of Homoeopathy as Taught by Hahnemann.
The classification of diseases adopted by Hahnemann includes two types, acute and chronic. §§ 72-82, Organon.
Acute diseases originate from defective hygiene, errors in diet, physical agents, cold, heat and other atmospheric changes, mental and moral influences.
Again, telluric and meteoric and bacterial influences give rise to acute diseases, attacking a number of individuals, at the same time giving rise to epidemic and contagious diseases. Besides these general causes, there are types of acute disease that are transient activities of the hitherto dormant psoric miasm, rendered so from some cause or other.
It is well to bear this possible cause of certain acute diseases in mind, since corresponding antipsoric remedies may possibly come into requisition for their cure or temporary subsidence.
Chronic diseases are such as are produced by infection from a chronic miasm, and which the vital powers of the organism, aided by hygienic and dietetic and sanitary measures are not able to extinguish. The chronic miasms giving rise to all forms of chronic disease are psora, syphilis and sycosis. Hahnemann does not classify among these chronic diseases such as result from living under unhygienic and unsanitary influences, or trying mental conditions, dietetic errors, excesses of all kinds, etc. These diseases disappear of themselves by mere change of regimen and surroundings and removing the cause, provided, there is not present one of the three chronic miasms that are the real causes of all chronic disease.