Many elderly people will complain that their neck area feels tight, thinking that it must be cloudy blood and they urgently need qi and blood circulation, etc. They are more likely to have similar phenomena after eating a big meal or seafood, and then they will say that their cholesterol must be too high, hoping that they can restore normal blood circulation through various means. But what exactly is cholesterol? What kind of effect does it have on blood vessels? In fact, cholesterol is an essential component of the human body, about one-third of which comes from dietary intake and two-thirds from the body’s liver synthesis. Among the cholesterol categories that are most relevant to disease diagnosis are the following: high-density cholesterol, low-density cholesterol, very-low-density cholesterol, triglycerides, and in addition, the total cholesterol index is also obtained during testing. Low-density cholesterol carries cholesterol around in blood vessels, so if the concentration of low-density cholesterol and very low-density cholesterol is high, it will easily accumulate in the endothelium of blood vessels and lead to lesions and blockage of blood vessels; on the contrary, high-density cholesterol will bring cholesterol back to the liver for storage, so it can reduce the chance of endothelial lesions, so it is called good cholesterol. The concentration of cholesterol can protect the health of blood vessels. Although triglycerides do not have a significant effect on blood vessel obstruction, studies have shown that when triglycerides are too high, the blood is too thick and can lead to acute pancreatitis, so it is important to be careful. There are five types of drugs that can control various cholesterol concentrations according to different degrees: fibrate derivatives, bile acid binding resins, nicotinic acid, statins, etc. The physician will prepare a treatment plan according to the cholesterol concentration index of the patient and prescribe one to several drugs. The description is as follows: 1. Fibrate derivatives mainly reduce triglyceride concentration, but may cause nausea, vomiting, diarrhea, stomach pain and increase in liver function index. 2.Bile acid binding resin neutralizes bile acid in the gastrointestinal tract, so that the bile acid binding compound rich in fat and cholesterol cannot be absorbed, and can compensate for the liver’s consumption of more cholesterol to produce bile acid to lower cholesterol in the body, but may cause diarrhea and constipation and other gastrointestinal symptoms. Niacin is one of the vitamin B complex, which can lower triglycerides and low-density cholesterol and raise high-density cholesterol in large doses, but it may cause rash, gastrointestinal discomfort, high uric acid, gout and increased liver function index, and long-term use may increase the chance of gallstones, so it is prohibited for patients with gallstones. 4, cholesterol absorption inhibitors can inhibit the absorption of cholesterol in the small intestine, lowering low-density cholesterol, which may cause diarrhea, cough, abdominal pain, pharyngitis, etc. 5, statins can inhibit the synthesis of cholesterol in the body, is the most powerful cholesterol-lowering drugs, side effects include headache, nausea, fatigue, liver function index, etc., and sometimes also cause muscle pain symptoms.