Patients with diabetes may be asymptomatic
Acute symptoms range from those of nonketotic hyperglycemia (e.g. polyuria, polydipsia, polyphagia) to DKA (ill appearance, acetone breath, Kussmaul's breathing, somnolence)
Diabetes mellitus 
Physiologic stress response 
Hypertension 
Metabolic syndrome
Nonketotic hyperglycemia
Diabetes medications
Hyperosmolar hyperglycemic state 
Peripheral artery disease