I have a higher rhr (80-95) for a high level athlete and hr goes up very quickly.visible pulse.lightheaded at times.very hydrated. is this ist?

Heart rates: Rapid resting heart rates in a young, athletic female raise the question of overactive thyroid,anemia or iron deficiency. The latter 2 result from heavy menstrual periods. Lightheadedness can occur with low or high blood pressure. Your physician can check your sitting and standing blood pressure and perform a cardiac examination and also order appropriate tests in order to explain your symptoms.