So, Hahnemann believed the bulk of chronic diseases were caused by "miasms". I beliebve the term miasm means a cloud or fog. ANyway, he believed most, 80-90% were casued by the psora miasm. Psora manifests itself with symptoms such as :skin problems, mental illness, allergies, organ disfunction (and a thousand others). The psoric miasm is "caused" by a suppression of a skin eruption - psoriasis, eczema, or scabies (his "itch" HC misinterpreted). SO if a person has psoriasis and it is suppressed from the medicine at hahnemanns time then he would go into the miasmatic state and possibly pass this state onto his offspring and future generations So a hundred years from the origional "case" a person with allergies and stomach ulcers is still said to have the psora miasm even though he/she or even possibly no one for generations before her hasd a suppresed skin eruption. Sigh, I really have to go....
SO - now the syphillitic miasm foollows the same thinking. It and sycosis accounts for only 20-15% of miams (at the time of hahnemann) and was origionally caused by a suppressed syphilis. This supppresssion causes the miasm to show itself as nervous disorders, suicidal tendencies, alcoholism, heart problems, (and a thousand others). Now - this miasmatic "taint" or "stain" is carried from one generation to the next, manifesting itself through the myriad of symptoms associated with it until today when a person has an alcoholic father and she has suicidal tendencies with xyz other symptoms so we say she has a syphilitic miasm. She does not not did not ever have syphilis.
Crap - I really gotta go - I am not finished though cause I want to address Leelas comment about psora turning to syph so I'll be bakc later.