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.
If you have a lump behind your knee that's filled with fluid and causes a feeling of tightness, it might be a Baker's cyst. Doctors also call it a popliteal cyst. Swelling in the knee. This happens when the fluid that lubricates your knee joint increases. When pressure builds up, fluid squeezes into the back of the knee and it creates the lump or cyst. Itâs common with all forms of arthritis. A Bakerâs cyst can also be brought on by a sports-related injury or blow to the knee. Gout is another common cause.