Tuberculosis and rainy days may be related to factors such as low immunity and poor blood circulation. 1. Low immunity: When it rains on a cloudy day, the immunity of the respiratory system of the patient is poorer due to the lower temperature, which may also lead to the aggravation of the disease, thus causing tuberculosis patients to suffer from rain on a cloudy day. 2. Poor blood circulation: Poor blood circulation may be caused by damage to circulatory system tissues and organs, resulting in symptoms such as cold hands and feet, numbness and tingling in the limbs, and so on, and thus patients with pulmonary tuberculosis may suffer from rain on cloudy days when their blood circulation is poor. Tuberculosis patients are relatively afraid of cold, usually need to pay attention to keep warm, the symptoms of rain on cloudy days, it is recommended to go to the hospital in time for examination to determine the cause of the disease and actively cooperate with the treatment.