Egg yolks contain two amino acids and at least one vitamin that contain sulfur. The sulfur is released as the compounds degrade in cooking. Hydrogen sulphide is a physiologically active molecule that is produced naturally by most lifeforms, and is a cellular messenger molecule. It has important roles in many processes.
1 An injury, infection, or an underlying rheumatic condition can cause bursa inflammation. 2  Bursitis is diagnosed by identifying swelling, tenderness, and pain with motion in the affected area. 3  Treatment of bursitis is directed toward reducing inflammation and treating any infection present.
Bursitis may also develop in the knee from overexertion while playing tennis. The knee may also suffer a sprain, strain or tear in the ligament or cartilage. Arthritis can also set in after years of strain on the knee joint, resulting in pain, swelling, stiffness and reduced range of motion.