How does arthritis affect the knee joint?

Physical therapist Peggy Brill explains the factors that could cause arthritis and inflammation in the knee.

Learn what causes knee injuries and why they happen to people of all ages, all the time.

What is "frozen shoulder" exactly and why are some people more at risk than others?

From sore joints to sports injuries, get the lowdown on treating your most common aches and pains.

Back pain is common, but it's not inevitable. Work on these habits every day to help relieve strain on your back.

The answer might surprise you.