Okay i am really freaked out. My right arm has alway been a little stronger than my left, but they are almost equal in ability (or have been) Today, i decided to lift weights, and discovered that my left arm could barely lift 15 lbs weight, while my right arm could do it with ease!. I then flexed my left arm, and felt it, and the bicep was squishy!. my right arm is perfectly fine with a had muscle. it's almost like my left bicep has disappeared! i bareley notice anything when i flex my left arm. Understand that i lifted weights about a week ago, and then i could lift 20 lbs (curling) with both arms and my muscles looked about the same size. Now there is a stark contrast between the 2. What does this mean and what should i do?