Muscle Weakness
It is normal to feel weak after a long stint in the gym. If you often feel that you cannot control your muscles, however, there could be a larger problem.
Brains are important in controlling the movement of your muscles. Any problem in this region can lead to a loss of coordination that feels much like weakness. This is particularly true of tumors in an area called the motor complex. This area controls the coordination of muscle movement, so any mass here can affect movement.
