I have a great deal of pain in the pronator teres or the flexor carpi radialis of my right arm. The pain is present only in certain movements or long duration of having my elbow bent. For example, it hurts to brush my teeth or put a bow in my daughters hair, yet I can lift a 50 pound bag with no pain. The pain also comes on when I open a jar, but only when the top begins to spin. If the pain last too long, the pain radiates into the lower to mid section of my bicep muscle.