Carnitine deficiency is a condition in which the carnitine concentration in the patient’s body is lower than the normal level of the human body and belongs to the human metabolism. There are three main conditions of carnitine deficiency: First, systemic carnitine deficiency, primary carnitine deficiency is recessive genetic, mainly caused by genetic defects. It is mainly caused by genetic defects. It develops in infancy and early childhood, and its main manifestations are slow intellectual development, immobility, nausea, vomiting, lethargy, constipation, general weakness, etc. The main symptoms include exercise intolerance, easy fatigue, difficulty in learning, proximal muscle weakness, vomiting, abdominal pain, constipation, decreased immune function, and recurrent infections. Third, cardiomyopathy, followed by patients can appear hypertrophic cardiomyopathy, often with palpitations, dyspnea, cardiopulmonary insufficiency, etc., the acute phase of the disease onset of liver function damage, often with metabolic acidosis and hyperammonemia.