The causes of elevated blood pressure in the fall are related to factors such as environmental temperature, work and rest time, and diet. 1. Environmental temperature: the weather in the fall is getting cooler, and the temperature difference between day and night is relatively big, which makes the blood vessels contract, and thus the symptom of increased blood pressure occurs. 2. Work and rest time: the lower temperature in the fall makes the body sleepy, which leads to longer sleeping hours and less time for exercise, thus increasing blood pressure. 3. Diet: As the weather gets colder in the fall, the consumption of high-calorie foods increases, resulting in fat storage, which may cause an increase in blood pressure. If your blood pressure rises frequently in the fall and the value increases greatly, you need to go to the hospital for testing and take antihypertensive drugs under the guidance of a doctor to standardize your treatment if necessary.