• Tightness any activity or situation in which those muscles stay contracted beyond or independent of physical exertion, usually caused by too much muscle stimulation in the muscles. Long-term tightness in the muscles can cause pain
• Contracture Abnormal permanent shortening of muscle tissue, rendering the muscle highly resistant to stretching. A contracture can lead to permanent disability. It can be caused by fibrosis of the tissues supporting the muscle or the joint, or by disorders of the muscle fibers themselves.