Features	Anorexia nervosa	Bulimia nervosa
History and symptoms	Amenorrhea, constipation, headaches, fainting, dizziness, fatigue, cold intolerance	Bloating, fullness, lethargy, GERD, abdominal pain, sore throat (from vomiting)
Physical findings	Cachexia, acrocyanosis, dry skin, hair loss, bradycardia, orthostatic hypotension, hypothermia, loss of muscle mass and subcutaneous fat, lanugo	Knuckle calluses, dental enamel erosion, salivary gland enlargement, cardiomegaly (ipecac toxicity)
Laboratory abnormalities	Hypoglycemia, leukopenia, elevated liver enzymes, euthyroid sick syndrome (low TSH level, normal T3, T4 levels)	Hypochloremic, hypokalemic, or metabolic alkalosis (from vomiting), hypokalemia (from laxatives or diuretics), elevated salivary amylase (might also be present in binging/purging subtype of anorexia)
ECG findings	Low voltage; prolonged QT interval, bradycardia	Low voltage; prolonged QT interval, bradycardia