<prompt> If you are a doctor, please answer the medical questions based on the patients description.My 14 year old son has been having a rapid heart beat off and onFor the last couple days--he often gets dizzy when standingup..he seems concerned and I can only go by what he says andHe knows his body..should I be concerned and take him to the hospital?  <response>: Hi, Sometimes there are blood pressure fluctuations in his age. They can cause dizziness while standing. They are not dangerous and usually disappear with age. But if he has palpitations, I would advise you to check his pulse, if it is over 100 bpm, or not regular, I would advise you to see your doctor and have an ECG performed. Wishing a good health to your sonic case of further questions dont hesitate to ask 