Below are some common old descriptions of commons deaths.
Brain Fever in children = meningoencephalitis
Brain Congestion in an adult = stroke
Brights Disease is a category of kidney diseases. This term is not used in modern times. Acute or chronic nephritis (kidney disease).
Consumption = Tuberculosis
Dropsy = hydropsy, is an abnormal accumulation of fluid in the body
Flux = probably Dysentery from unsanitary water source
General Paralysis of the insane = syphilis
La Grippe = Influenza aka the Flu
Liver disease = Hepatitis
Paralysis = stroke
Paralysis Agitans = Parkinson's Disease
Phthisis = Tuberculosis
Summer complaint = Cholera almost always an infant or young child. Common with spoilt milk.