Dear doctor, recently I went to play football, after a few days my heart throbbed a few times and then it went away. After a few days, I felt that my heart was not feeling well, so I went to the doctor, when I went to the doctor, I went to the doctor for regular echocardiography and electrocardiogram, X-ray, but said I was still normal, there were no signs of heart disease but after a few days. One day, I felt dizzy and tired. So can I ask if a heart attack after playing sports is something to worry about? Thank you.