We all know that selenium is a trace element required by the human body, precisely because it is a trace element, so there is a possibility that it is not supplemented in daily life, which will lead to a series of symptoms of selenium deficiency, below we will give you a detailed introduction to the symptoms of selenium deficiency and the hazards. China is a more serious selenium deficiency countries, so scientific and orderly selenium supplementation is the urgent need to improve the dietary structure of our residents! Selenium is called “the fire of life” by scientists, human cancer, cardiovascular disease, children’s mental retardation, Alzheimer’s disease and 42 kinds of diseases related to selenium deficiency, 70% of China’s regions lack of selenium. Selenium deficiency in human body will lead to the above-mentioned decline in human body functions, and the recent statistics show that when the human body is deficient in selenium, the risk of contracting highly pathogenic viral diseases increases significantly. Diagnosis and Identification of Selenium Deficiency Selenium deficiency can cause leukodystrophy in animals, and there is a correlation between selenium in the human environment and selenium load levels in humans and the onset of Keshan disease. Supplementation of a certain amount of selenium to the population in the disease area can reduce the incidence of Keshan disease. In addition selenium has been shown to have anti-carcinogenic effects against a variety of carcinogens in animal experiments. However, excessive amount of selenium can cause selenosis, hair loss and nail loss. Acute type should be distinguished from acute myocarditis, acute myocardial infarction, acute gastritis, biliary ascariasis. The chronic type should be distinguished from dilated cardiomyopathy (DCM), perinatal cardiomyopathy, coronary artery disease, pericarditis (chronic) and wind heart disease. The subacute type should be differentiated from acute and chronic glomerulonephritis or nephropathy, bronchopneumonia (combined with heart failure), endocardial elastosis, and pericarditis. The underlying type should be distinguished from focal myocarditis, hypertrophic non-obstructive cardiomyopathy, and cardiac neurosis. Selenium deficiency can cause leukodystrophy in animals, and there is a correlation between selenium in the human environment and the level of selenium load in humans and the development of Keshan disease. Supplementation of a certain amount of selenium to the population in the disease area can reduce the incidence of Keshan disease. In addition selenium has been shown to have anti-carcinogenic effects against a variety of carcinogens in animal experiments. However, excessive amounts of selenium can cause selenosis and hair and nail loss.