According to the China Disease Control WeChat official account, it was supposed to be the time when everything recovered from winter to spring, but in fact, this period was the "high-risk window period" for cardiovascular and cerebrovascular diseases. In meteorology, cold air activity is still frequent at this time, with temperatures fluctuating like a roller coaster; Medically, this intense temperature fluctuation is known as "late spring cold" and is a high-risk factor for emergencies such as myocardial infarction and stroke. Why do temperature fluctuations harm blood vessels? When the temperature drops sharply, the human body will activate the "warm mode": the sympathetic nervous system is excited, causing peripheral blood vessels to contract to reduce heat loss. Although this physiological reaction can keep warm, it can cause a rapid increase in blood pressure in a short period of time. Meanwhile, cold stimulation can increase blood viscosity, making it easier for platelets to aggregate and form blood clots. In addition, respiratory infections are high in spring, and viruses such as influenza themselves can increase the risk of blood clots through inflammatory reactions, becoming the "trigger" for triggering cardiovascular and cerebrovascular events. Who is the high-risk group? The elderly are the first to bear the brunt. As age increases, the elasticity of blood vessels decreases and their ability to regulate temperature changes weakens. Especially for people with basic diseases such as hypertension, coronary heart disease and diabetes, cold stimulation may lead to uncontrolled blood pressure or rupture of atherosclerotic plaque. In addition, smokers, obese individuals, and elderly people who have morning exercise habits but lack warmth should also be particularly vigilant. How to safely navigate through the 'dangerous period'? There are guidelines for "spring cover": do not rush to take off winter clothes, especially protect your head, neck, and hands and feet. When going out, use the "onion style dressing method" to adjust clothing according to the ambient temperature. Avoid exercising outside during the lowest temperature period in the morning (6-9am), which can be changed to after 10am. Monitoring should be diligent: hypertensive patients should increase the frequency of blood pressure monitoring, and if their systolic blood pressure continues to exceed 140 mmHg, they should seek medical attention and adjust medication in a timely manner. Never stop taking medication on your own just because you don't feel cold. Lifestyle adjustment: Maintain sufficient water intake (1500-2000 milliliters per day), dilute blood viscosity; Avoid high salt and high-fat diet; Maintain moderate ventilation indoors, but avoid direct cold air blowing. Identifying danger signals: sudden chest pain (especially compression pain behind the sternum), persistent headache and dizziness, unilateral limb numbness and weakness, unclear speech or blurred vision may all be signs of cardiovascular and cerebrovascular emergencies. It is necessary to immediately call the emergency number and seize the "golden rescue time". Although the 'spring chill' is short-lived, it is a hurdle for cardiovascular and cerebrovascular health. Pay attention to weather forecasts, keep warm and warm, and regularly monitor indicators in order to safely welcome the true warmth of spring and the blooming of flowers