Dopamine is a brain chemical called a neurotransmitter that
carries signals between nerve cells and helps the brain perform
critical functions. Dopamine helps the brain control motor
functions and movement and possibly to perform other functions
related to mood. An imbalance or shortage of dopamine can cause
brain dysfunction and disease. For example, in Parkinson's
disease, underproduction of dopamine interferes with the
transmission of signals directing movement. This can cause
tremors, or shaking, often in a hand, arm, or leg as well as
slow, limited movement (bradykinesia), especially when the
person tries to move from a resting position. eMedicineHealth
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