Low HDL is more harmful and may induce coronary heart disease, stroke and cerebral infarction. 1. Coronary heart disease: low HDL without timely treatment may lead to increased blood viscosity, further inducing coronary heart disease, the patient will have chest tightness, swelling and pain and other symptoms. 2. Stroke: low HDL, induced by coronary heart disease, if not treated in time, easy to cause the formation of arterial plaque, when the plaque rupture, easy to block the cerebral blood vessels, and ultimately induced a stroke, easy to cause brain death. 3. Cerebral infarction: extremely low HDL in serum will easily cause lipid metabolism disorders, which will further cause cerebral infarction after aggravation of the condition, posing a greater threat to the patient’s life. It is recommended to consult a doctor in time to analyze the cause of low HDL and then treat the cause of low HDL; through early treatment, the condition can be effectively prevented from related complications after the condition is under control.