Nausea
Vomiting
Diarrhea
Altered mental status
Dyspnea
Hypotension
Tachycardia
Tachypnea
Metformin-associated lactic acidosis
Type A 
Starvation ketoacidosis
Hypovolemia
Nonketotic hyperglycemia
Cardiac failure
Diabetic ketoacidosis
Sepsis