I recently had a heart physical examination because I was experiencing occasional sharp pains in my chest and a fast pulse, reaching 110 beats per minute. I also felt fatigued. During my general physical examination at the heart hospital, I underwent several tests, including an ultrasound, blood test, electrocardiogram, and stress test. The doctor concluded that everything was okay. However, I sometimes notice my heart rate increasing to 90 beats per minute during light activities, and I feel fatigued. My question is, is it normal to experience a rapid heart rate accompanied by fatigue? Thank you, doctor.