LDL 3.40 mmol/L does not necessarily require treatment and needs to be judged in conjunction with the patient’s presence or absence of underlying disease. If the patient is also combined with hypertension, diabetes, cardiovascular and cerebrovascular diseases, then need to be treated with medication. 1. General population: For the general population without the combination of certain underlying diseases such as hypertension, diabetes, etc., LDL 3.40mmol/L can not take lipid-lowering drugs for the time being. These people can control the LDL level by adjusting their lifestyle, such as healthy diet, appropriate exercise, etc. If the LDL level is still around the upper limit of the normal range after 3 months, they need to take lipid-lowering drugs under the guidance of a doctor. 2. High-risk groups: if the patient at the same time combined with hypertension, diabetes, cardiovascular and cerebrovascular diseases, such as coronary heart disease, cerebral infarction, etc., LDL 3.40mmol / L need to take oral lipid-lowering drugs, and LDL control range is more stringent. Warm tips: LDL 3.40mmol/L does not necessarily need treatment, the general population can not take lipid-lowering drugs first; but patients with risk factors should be under the guidance of the doctor to choose the appropriate lipid-lowering drugs.