Core Insights - The article discusses the health risks associated with declining temperatures, particularly focusing on respiratory and circulatory system impacts, and provides recommendations for health protection during cold weather. Group 1: Health Risks - Decreased temperatures can adversely affect the respiratory system, leading to prolonged survival of flu viruses and increased symptoms such as runny nose and sneezing due to irritation of the mucous membranes [1] - Cold air can cause blood vessel constriction, leading to increased peripheral vascular resistance and elevated blood pressure, particularly affecting hypertensive patients [1] - The incidence of acute coronary syndrome significantly rises during cold waves, with over 70% of cases occurring in middle-aged and elderly patients [1] Group 2: Health Protection Recommendations - Precise warming strategies include layered clothing, maintaining indoor temperatures between 18-22 degrees Celsius, and using humidifiers to keep humidity at 50%-60% [2] - Respiratory protection measures involve regular hand washing, wearing masks, and ensuring proper ventilation by opening windows 2-3 times daily for 15-30 minutes [2] - High-risk groups, such as the elderly and those with chronic diseases, should minimize outdoor activities and be closely monitored for symptoms like chest pain or difficulty breathing [2]