Source: Medical Xpress
Each of our arms and legs have compartments that contain muscles and nerves which are surrounded by tough walls of tissue called fascia. When we experience an injury or overuse muscles, these compartments can fill with fluid and swell. In some people, the fascia surrounding each compartment is not very flexible and swelling can restrict blood flow, which can lead to pain, numbness and weakness in the affected limb. These symptoms may be a sign of compartment syndrome.