Muscle stiffness after a stroke, known as spasticity, happens when damaged brain pathways lose the ability to send normal relax signals. Instead of resting, affected muscles stay in a constant, high-tension state. This leaves arms or legs feeling heavy, rigid, and hard to move, making straightening a joint feel like stretching a thick rubber band. Muscles may flex involuntarily on their own without your control. Over time, this continuous contraction triggers deep muscle ache

When a stroke causes spasticity, muscle stiffness usually locks one side of the body into awkward, tight positions. In the arm, this shows up as a tight fist, a bent wrist, or an elbow pulled inward against the chest. In the leg, it causes a stiff knee or a foot pointing down and inward, making it hard to walk without tripping. Over time, these locked muscles lead to painful spasms and stiff, aching joints. Muscle stiffness after a stroke—medically known as spasticity—occurs

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