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.
1) Bakers Cyst. What is it: Inflammation of the popliteal bursa (fluid filled sac) at the back of the knee. It is the most common cause of pain behind the knee. Symptoms: Swelling (like a small water balloon), tightness and pain behind the knee. Aggravating Activities: Bending and straightening the knee, walking, kneeling. Onset: Can come on after a blow to the back of the knee but usually comes on gradually.