Heavy rain warnings have been lifted across the country, but the intense heat combined with the humidity left behind by the strong rain can threaten health. The medical community has urged caution, saying that heat waves with high humidity interfere with the evaporation of sweat, making it difficult to regulate body temperature and increasing the burden on the heart and lungs. Let's learn about health management for patients with severe and chronic diseases during the humid summer season with the help of Shin Hyeon-young, a professor of family medicine at Seoul St. Mary's Hospital, Catholic University of Korea. According to the medical community on the 16th, during heat waves with high humidity, people with severe diseases such as heart failure, ischemic heart disease, chronic obstructive pulmonary disease (COPD), asthma, and chronic kidney disease have a higher risk of heat-related diseases and worsening of underlying diseases than the general public. People with cardiovascular diseases have an increased risk of developing angina, worsening heart failure, and arrhythmia due to increased heart burden in a high temperature and humidity environment. Avoid excessive going out or exercising, and if you experience chest pain, difficulty breathing, or severe dizziness, you should immediately seek medical attention. People with cerebrovascular disease may have an increased risk of stroke due to dehydration and changes in blood pressure. Supplement sufficient fluids and avoid sudden paralysis, speech impediment, or severe headache.