The normal range for homocysteine at age 50 to 60 is 5 to 15 mmol/L. A value >15 mmol/L indicates a higher risk of cardiovascular disease. Homocysteine is an amino acid synthesized by the body and can participate in oxidation and reduction processes in the body. The normal range of homocysteine in the blood is 5-15 mmol/L. If the value is >15 mmol/L, hyperhomocysteinemia is diagnosed, which will substantially increase the risk of cardiovascular and cerebrovascular diseases. If the patient suffers from high blood pressure and at the same time the examination finds that homocysteine is elevated, then it is H-type hypertension, in this case, taking medication to control blood pressure at the same time must be combined with oral folic acid, which can help to further reduce the level of homocysteine. Elevated homocysteine may also occur in patients who have had a stroke or previous cerebral hemorrhage or cerebral embolism. Patients with significantly elevated homocysteine levels should also pay attention to their diet, exercise more, and take medications such as folic acid tablets to keep homocysteine values within normal limits if necessary.