If the patient has a ventricular septal defect, swimming can lead to ischemia and hypoxia, and thus, it is not advisable for the patient to swim. If symptoms such as palpitations or breathing difficulties occur, this can be very dangerous, and I would personally advise against going into the water. It is also crucial to actively treat this congenital heart disease. I suggest that the patient should undergo a cardiac echocardiography at a hospital for a clearer diagnosis. Currently, the treatment mainly focuses on symptomatic treatment, and it is recommended that the patient considers surgical options to alleviate the suffering and improve the condition. During this period, attention should also be paid to a healthy diet, especially avoiding spicy and stimulating foods.