Not a doctor but I’ll try
Jaundice
[insert any organ] disease
[insert any organ] cancer
Mouth ulser
Fever
Common flu
Rocky Mountain fever
Influenza ( any type )
Malaria
Dengue
Tumour
Terratoma (tumour but worse)
Bubonic bacteria
Whooping cough
Dry cough
Cholera
Diarrhoea
Spanish flu
covid
Chicken/small pox
Rabies
Brain Aneurysm
amoeba infection
Asphyxiation
Measles
Rubella
Lyme disease
Ebola
Osteoporosis
Leukaemia
Typhoid
(I know more but too lazy to remember all of them)