Muscle stiffness refers to a sensation of tightness and reduced flexibility in the muscles. It can be caused by various factors, including prolonged immobility, overuse, muscle strain, or certain medical conditions. Muscle stiffness can limit the range of motion and cause discomfort or pain. Treatment options for muscle stiffness may include stretches and exercises to improve flexibility, heat or cold therapy, massage, and over-the-counter pain relievers. It’s important to identify the underlying cause of the muscle stiffness and consult with a healthcare professional for appropriate management.