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

A stroke can damage the brain's "brakes" that normally tell your muscles to relax. Without these calming signals, your muscles stay continuously tight and clenched on the side affected by the stroke. This muscle stiffness causes noticeable posture changes. In the arm, it often leads to a tight fist, bent wrist, or an elbow pulled close to the chest. In the leg, it can cause a stiff knee or a foot turned downward, making walking difficult. Over time, this constant tightness ca