LDL 3.55mmol/L is a borderline elevated level and does not require medication if it is not accompanied by other risk factors such as hypertension or coronary heart disease, please follow your doctor’s instructions. The appropriate level of LDL is <3.4mmol/L; ≥3.4mmol/L and <4.1mmol/L are borderline elevated; when LDL is ≥4.1mmol/L, it is elevated. Elevated LDL is mostly associated with familial hypercholesterolemia, mixed hyperlipoproteinemia, diabetes mellitus, hypothyroidism, and nephrotic syndrome. LDL is a cholesterol-rich lipoprotein, a complex containing protein cholesterol phospholipids. LDL can contribute to the formation of arterial walls, and arterial plaque is a risk factor for atherosclerosis, which can easily lead to the development of coronary heart disease. LDL 3.55mmol/L is a borderline elevated level. If the patient has no other risk factors, he/she may not need to take medication, but he/she should actively carry out lifestyle interventions, such as eating a light diet, eating less cholesterol-rich foods, such as animal offal, egg yolks, fatty meats, and seafoods rich in high cholesterol, etc., as well as increasing physical activity and controlling his/her body weight. LDL 3.55mmol/L, if the patient has hypertension, coronary heart disease, diabetes and other risk factors, can consider lipid-lowering treatment, commonly used drugs are simvastatin, atorvastatin, etc., the specific use of medication need to comply with medical advice.