As i mentioned a friend has a son 16 years old suffering from tachycardia and chest pain after exercise, problem becoming worse. is tere a danger of sudden death?
There's no way for us to tell without more information. Some tachycardia is uncomfortable but not life threatening. Some tach can be deadly. Has the young man worn a heart monitor to record the arrhythmia? If so, then you and he can ask the doctor what this will mean for his future.