# Probability Analysis of Hypertension-Related Symptoms Based on XGBoost and Clustering Algorithm
## 1 Introduction  
The world economy is developing rapidly in recent decades, and cardiovascular disease has become the main cause of death in the world [1]. According to the survey, at present, 30% of the world's deaths are caused by 52 cardiovascular diseases [2]; hypertension is a disease associated with cardiovascular disease, accounting for 13% of cardiovascular diseases, that is, the high prevalence of hypertension worldwide is one of the reasons for the high prevalence of cardiovascular diseases. It is a chronic disease and has a serious impact on human health. Over time, its prevalence worldwide has increased year by year, but its awareness rate and control rate are still very low. Hypertension can damage the vascular system, causing major diseases such as myocardial infarction, coronary heart disease and stroke secondary diseases. Studies by [PERSON] and [PERSON] [3] have shown that if blood pressure is high in early adulthood, the mortality rate of cardiovascular disease and coronary heart disease will increase in a few decades. Around 54% of the world's strokes, 47% of ischemic heartdisease, 75% of hypertension, and 25% of other cardiovascular diseases are caused by high blood pressure [4]. In China, the number of people suffering from hypertension is on the rise due to poor awareness, treatment and control of hypertension, which is much lower than that in the West, especially among young people and people in remote areas. The incidence of hypertension has increased greatly. In 1991, the number of people over 15 years of age suffering from hypertension increased by 60% compared with 1980. In 2002, the prevalence rate of hypertension in those over 18 years old reached 18.8%. Two out of 10 people suffered from hypertension, and the number with high blood pressure reached 153 million, accounting for 20% of the world's total hypertension. Mild to moderate hypertension accounts for 90% of cases and normal blood pressure does not exceed 50% [5]. According to a recent survey, about one-third of adults suffer from hypertension. Half of them will receive treatment for hypertension, but only 5% of them will eventually have their blood pressure properly controlled [6]. In China 750,000 people die of hypertension every year. Obesity is a major contributor to hypertension. In China, the proportion of obese and overweight people aged 7-18 increased 28-fold between 1985 and 2000. In 1992-2002, 260 million people were overweight or obese, so hypertension will continue to deteriorate in the future [7]. Research on hypertension has become a key issue. Hypertension itself is not terrible, but it can cause enormous damage to the target organs. The target organs of hypertension are mainly the heart, kidney, brain, blood vessels and so on. [PERSON] et al. [8], [PERSON] et al. [9], and [PERSON] et al. [10] studied the damage of target organs caused by hypertension, and it turned out that high blood pressure causes great damage to the target organs. Hypertension has become a very common disease worldwide, so in view of its great harm to the human body, how to detect hypertension and treat it is urgent. The classification of hypertension in Chinese hospitals is only based on severity grades, such as hypertension grade 1 and hypertension grade 2. According to the severity of the patients, appropriate drugs are used to treat hypertension. Although this classification method can be applied, it is not rigorous. As mentioned above, half of hypertensive patients will suffer from target organ damage; in some it caused kidney damage, in some it caused heart damage, some people suffer damage to one target organ and others to two target organs, which means that although these patients are judged to have hypertension, there are differences between them. Patients with the same target organ injury may have some similarities, which requires analysis of their detection indicators data, which cannot be generalized, so the current hospital classification according to the severity of the disease is not rigorous.