Doctor, i'm male and 14 years old. just not long ago, i felt my heart beat kinda strange, whenever it's beat i'm feeling very dizzy, happened 3 times.

Tell Parents: You should have your parents talk to your pediatrician. It may be something simple but you should be checked.

Need more info: No problems with thyroid. No medications. Caffeine use ? Stimulants ? Have you had a cardiac holter monitor run ? Have you spoken with a local doctor about this? A good exam would include an exam of your thyroid, a good listen to the heart sounds. Blood tests for potassium and thyroid hormones. Sometimes the problem is caffeine or other stimulants.