Here are explanations for some the archaic malady terminology posted above ...
Rising of the lights
Rising of the lights was an illness or obstructive condition of the larynx, trachea, or lungs, possibly croup. It was a common entry on bills of mortality in the seventeenth century. Lights in this case referred to the lungs. ...
https://en.wikipedia.org/wiki/Rising_of_the_lights
King's Evil
The King's Evil was the name given to scrofula, the swelling of the bones and lymphatic glands in the neck. Now recognised to be tuberculosis.
https://historyhouse.co.uk/articles/kings_evil.html
impostume (aka imposthume)
... A collection of pus or purulent matter in any part of an animal body; an abscess.
https://www.wordnik.com/words/impostume
LIVERGROWN
People who died of livergrown suffered from an enlarged (or failing) liver. Doctors could diagnose it through the combination of other symptoms, like jaundice and abdominal pain. It was commonly a result of alcoholism, but could be caused by a number of disorders.
https://www.mentalfloss.com/article/67247/15-historic-diseases-competed-bubonic-plague
CHRISOMES
Infant mortality was extremely high before the advent of modern medicine. The Bills distinguished abortive (miscarried), stillborn, infant, and chrisom deaths—the latter term specified infants who died within the first month of life, around the time they were baptized with special white cloths (which were called chrisomes).
https://www.mentalfloss.com/article/67247/15-historic-diseases-competed-bubonic-plague
TIMPANY
The condition of having serious swelling or bloating in the digestive tract, which produces a hollow sound when tapped, is still called tympany today. The sort that would have proven fatal to humans could have been caused by kidney disease, intestinal infections, or cancerous tumors.
https://www.mentalfloss.com/article/67247/15-historic-diseases-competed-bubonic-plague
TISSICK
The term tissick, a corruption of phthisis, originated in ancient Greek and persisted through Latin, French, and English for thousands of years, only to end up an obsolete word referring to a “wasting disease of the lungs,” according to the Online Etymology Dictionary. In the 17th century, that could indicate the wheezing and coughing associated with asthma, bronchitis, or possibly tuberculosis.
https://www.mentalfloss.com/article/67247/15-historic-diseases-competed-bubonic-plague
QUINSIE
Quinsie, which evolved from a Latin word meaning “choke,” is still occasionally used in modern England. It describes a complication of tonsillitis in which an abscess grows between the tonsil and the throat. Unless the abscess was removed, a patient could suffocate from the blockage.
https://www.mentalfloss.com/article/67247/15-historic-diseases-competed-bubonic-plague
FRENCH POX
When people across Europe came down with syphilis beginning in the 1490s, they blamed the French. (Perhaps they should have blamed Christopher Columbus and the Spanish, whom historians believe brought the bacterial infection back from the New World.) Rightly or wrongly, French pox is what the Bills of Mortality lists for deaths by advanced syphilis
https://www.mentalfloss.com/article/67247/15-historic-diseases-competed-bubonic-plague
BLOODY FLUX
Dysentery ...
https://www.mentalfloss.com/article/67247/15-historic-diseases-competed-bubonic-plague
Cut of the Stone
The surgical removal of a bladder stone.
http://www.homeoint.org/cazalet/oldnames.htm
Child Bed (Fever)
Infection in the mother following birth of a child, probably due to staphylococcus.
http://www.homeoint.org/cazalet/oldnames.htm
Wolf
A rapidly expanding growth, probably a malignant tumour.
http://www.homeoint.org/cazalet/oldnames.htm
Meagrom, Megrim
A severe headache, often limited to one side of the head.
http://www.homeoint.org/cazalet/oldnames.htm
Purples
This is a rash due to spontaneous bleeding in to the skin. It may be a symptom of some severe illnesses, including bacterial endocarditis and cerebrospinal meningitis.
http://www.homeoint.org/cazalet/oldnames.htm
Plannet
Plannet is likely a shorthand for “planet-struck.” Many medical practitioners believed the planets influenced health and sanity. A person who was planet-stricken had been suddenly maligned by the forces of particular planets. They would likely present symptoms also associated with aneurysms, strokes, and heart attacks.
https://www.mentalfloss.com/article/67247/15-historic-diseases-competed-bubonic-plague