Rheumatic heart disease is mainly caused by infections from hemolytic streptococci, leading to heart valve abnormalities and changes in cardiac function and structure. The condition most commonly affects the mitral valve, resulting in mitral regurgitation. Patients often exhibit symptoms of heart failure. Exposure to cold or catching a cold can exacerbate the burden on the heart, leading to increased cardiac load and worsening symptoms of heart failure. Therefore, patients with rheumatic heart disease are particularly susceptible and fearful of catching colds. It is crucial for these patients to stay warm, use medication promptly when symptoms of a cold appear, and avoid vigorous exercise to prevent an increased cardiac load and potential acute heart failure. (Medication should be taken under the guidance of a doctor.)