Cirrhosis
Diabetes due to iron deposition in pancreatic beta cells
Cardiomyopathy
Arthritis: knuckles of the second and third fingers most common
Bronzing of the skin
Hemochromatosis
Physiologic stress response 
Porphyria
Diabetes mellitus 
Amebiasis
Nonketotic hyperglycemia
Wilson's disease
Hyperosmolar hyperglycemic state 