Why does my heart speed up when i stand up? my heart has been acting strange lately. when i am seated my heart beat is normal, around 60 beats per minute. but when i stand it jumps to around 100 bpm. should i be worried about this?

When : When a person stands up it is normal for the heart rate to transiently increase, but in your case this jump in heart rate is a bit more than expected. You may be dehydrated. When sitting, blood pools in the legs. When a person stands, the heart and blood vessels act in a coordinated way to compensate against gravity and maintain adequate blood flow to the brain. When adequately hydrated, this is easy for the heart to accomplish and the change in heart rate is minimal. If a person is dehydrated, a larger percentage of their blood is pooled in the legs and the upper body blood vessels are relatively depleted. The "tank is empty" so to speak. In this circumstance it is harder for the heart to compensate for the standing, and in order to maintain an adequate amount of blood flow, the heart has to speed up. Try increasing your fluid intake and avoid excessive caffeine or alcohol, both of which act as diuretics. If your symptoms do not improve, see your doctor for further evaluation.

Depends: Its worth a medical evaluation.