Among persons over the age of 50 or so, chronic knee pain is usually due to osteoarthritis, a wearing away of the cartilage that cushions the knee.
Obesity increase the risk of knee problem;
Some of the more common causes and their manifestations include:
1 Arthritis, which is marked by gradually worsening pain and difficulty using the knee. Inflammation often develops, which accelerates the joint destruction.
2 Infection, in which bacteria or other organisms invade the joint and cause severe inflammation, swelling, pain and often fever and chills.
3 Kneecap injuries and disorders, which range from a fractured patella to softening and wearing away of the knee cartilage.
4 Tendinitis and bursitis, which are especially common among runners and persons who kneel a lot or engage in other activities that stress the knee tendons, ligament, and bursas.
5 Torn ligament, in which there is sudden, severe pain, swelling, and joint instability.