The main causes of high blood pressure in the elderly are considered to be related to arteriosclerosis, hereditary factors, dietary factors, drug factors or other pathological factors. 1. Arteriosclerosis: the elderly are prone to arteriosclerosis due to ageing, which leads to a decrease in the elasticity of the arterial walls, resulting in increased blood pressure. 2. Genetic factors: if the parents of the elderly have high blood pressure, it is usually easy to produce genetic phenomenon, so the performance of high blood pressure in the elderly. 3. Dietary factors: If the elderly often eat food with high salt content, it is easy to trigger high blood pressure. 4. Drugs: If the elderly need to take drugs for a long time due to physical illnesses, such as painkillers, it will easily lead to high blood pressure. 5. Other pathological factors: some elderly people may have renal artery stenosis or adrenal gland diseases, which may easily produce high blood pressure. High blood pressure in the elderly is prone to induce cardiovascular and cerebrovascular diseases, so targeted treatment is needed to control the condition.