Creatine kinase 800+ U/L is significantly elevated and can be seen in acute myocardial infarction, rhabdomyolysis, hypothyroidism and other conditions. The normal value of creatine kinase is 50-310U/L for men and 40-200U/L for women. 800+U/L is obviously over the normal value, which can be seen in the following situations. 1. Acute myocardial infarction: patients have myocardial necrosis, myocardial enzymes will be released into the blood, creatine kinase level is obviously elevated, accompanied by through the elevation of the enzyme and electrocardiogram can be, the patient’s chest pain symptoms are obvious. 2. Rhabdomyolysis: Rhabdomyolysis will lead to the elevation of kinase, which can be seen in myopathy, oral administration of certain drugs. 3. Hypothyroidism: A decrease in thyroid hormones can also lead to elevated creatine kinase. In some people, elevated creatine kinase can be seen in physiologic conditions, such as strenuous exercise. Patients with significantly elevated creatine kinase should go to the hospital in a timely manner, under the guidance of a physician to clarify the cause of the disease and give symptomatic treatment.