Egypt's second faith is Coptic Christianity. Copts are heirs of an ancient Christian rite. Coptic Christianity was the predominant religion in Egypt until the 10th century when a lot of Christians diverted to Islam. Christianity itself was brought in Egypt by St. Mark in the middle of the first century AD.
Other possible causes of swelling behind the knee include abscesses (infections); tumors of the skin, soft tissue, or bones; bleeding; deep venous thrombosis (blood clot in the deep veins of the legs); or deformity of the joint after a fracture of any of the bones of your knee joint.
As you bend and straighten your leg you'll feel a swollen lump and pain behind your knee (feels like a water balloon). Since runners do one thingârunâlegs move in a very repetitive motion. Too much running without variations in speed or distance can cause excessive rubbing of the cartilages in and around the knee, which can irritate the soft tissues and posterior surface of the cap, Olsen says.