With the improvement of people’s living standard, the awareness of self-care is getting stronger, and the advancement of medical diagnosis enables early detection of many diseases. the common application of CT and MRI provides objective diagnostic basis for early diagnosis of cerebrovascular diseases. In clinical practice, we often encounter this situation: some patients go for CT or MRI because of headache, dizziness, trauma, etc. The patients do not have stroke manifestations such as hemiparesis, slurred speech, and distorted mouth and eyes, which are common in stroke, but one or more cerebral infarct foci are shown on CT or MRI; or the patients used to have one infarct foci, but multiple foci are shown on CT this time, and the patients’ clinical symptoms do not The patient’s clinical symptoms are not aggravated. The phenomenon described above is called asymptomatic cerebral infarction, which is a special type of cerebral thrombosis. According to statistics, the occurrence of asymptomatic cerebral infarction increases gradually with age, almost never occurring in people under 50 years of age, 5%-6% in people aged 51-59 years, up to 20% in people aged 60-69 years, and up to 33% in people aged 70 years or older, and even more in people with three or more risk factors, such as hypertension, diabetes mellitus, and smoking, almost 100% of them can be seen on MRI. Asymptomatic cerebral infarction foci. There were significantly more men than women. Although asymptomatic cerebral infarction does not present with hemiparesis, aphasia, etc., unlike general cerebral infarction, . Asymptomatic cerebral infarction may be the precursor stage of symptomatic cerebral infarction, which should never be taken lightly. 1. Why is there an infarct focus but no clinical symptoms? In our brain tissue, there are some parts with relatively important neurological functions, such as the internal capsule, the brainstem where nerve fibers are concentrated, the precentral gyrus and postcentral gyrus are responsible for movement and sensation, so a very small lesion in these parts will show obvious symptoms such as hemiparesis, hemianesthesia, coma, aphasia and slurred speech. However, the function of most brain tissues is responsible for neurotransmission or auxiliary to a specific neurological function, and lesions in these areas may sometimes be without any clinical symptoms, and sometimes clinical symptoms and signs are often less obvious and go unnoticed. 2.What are the causes of asymptomatic cerebral infarction? Like other cerebral infarcts, hypertension and diabetes mellitus are the most important and dangerous causes of asymptomatic cerebral infarcts. Research data show that hypertension develops into 70% of strokes, and asymptomatic infarcts with diabetes are significantly higher than those without diabetes, because diabetes promotes the formation of atherosclerosis of small blood vessels, which causes infarction of small arteries in the deep part of the brain. Chronic atrial fibrillation is also prone to asymptomatic cerebral infarction, and the lesions are often located in the occipital and parietal regions of the cerebral cortex, which are resting areas, and thus generally do not show obvious clinical symptoms and are easily overlooked. In addition, factors such as hyperlipidemia, heavy alcohol consumption, smoking and obesity are also the main causes of cerebral infarction. Some data show that: smokers have 2.5 times more chance of having a stroke than the general population. A foreign study found that: people who drink more than 3 hears of beer per day have about 3 times higher risk of stroke than those who do not drink. 3.Does asymptomatic cerebral infarction need prevention and treatment? The difference between symptomatic and asymptomatic cerebral infarction only lies in the difference of lesion sites, in essence, they are both atherosclerotic cerebral infarction, and early prevention and treatment can prevent clinical symptoms, so they should be treated as early as possible. Elderly people, especially patients with hypertension, diabetes mellitus and hyperlipidemia, should be alert to the presence of asymptomatic cerebral infarction, and it is better to have regular CT or MRI scans and outpatient follow-up if possible. Preventive and therapeutic measures mainly include: (1) Strict control of blood pressure, which is one of the most important measures to prevent cerebral infarction. Patients must take medication strictly according to medical advice, take medication on time, do not eat and stop or feel uncomfortable and then eat again, do not change medication at will, and do not stop medication on their own. (2) People who have diabetes should strictly control blood sugar? First of all, diet control, and strengthen physical exercise, such as still poor control, under the guidance of the doctor to use additional hypoglycemic drugs, during the use of drugs to frequently test blood sugar, urine sugar. (3) Chinese medicines to activate blood circulation and remove blood stasis: such as compound Danshen (recommended to be taken continuously, at least six months to take effect), Ginkgo biloba preparation, etc. (4) Anti-platelet drugs: such as enteric aspirin, resistacid, etc. (5) Adhere to long-term medication: in general, atherosclerosis becomes more and more serious with age. If cerebral infarction has already appeared, it means that atherosclerosis is quite obvious, so long-term medication is needed. Some patients think that their disease is relatively light, so they can take less medication, or intermittent medication, which can not achieve the purpose of treatment and prevention. The specific timing and dosage of medication should be according to the doctor’s prescription. In short, “asymptomatic cerebral infarction” is essentially the same as symptomatic cerebral infarction, so do not take it lightly.