Chest pain, feels heart beating fast as if just ran a race, throat feels tight, her age is going on 13 yrs?

Cardiologist: With these symptoms, i recommend an evaluation by a cardiologist and a check for an overactive thyroid in view of her complaint of a heart racing sensation.

Dysautonomia - MVP : May have rapid heartbeats in association with dysautonomia / mitral valve prolapse syndrome - neither are usually life threatening but both cause patients anxiety about their symptoms. See doctor to be checked . Read dr. Richard hoffman's book on mvp on amazon.Com. Increase fluid intake, try magnesium supplements.