Are you in your 20s or 30s and experiencing persistent knee pain? Have you been dismissing it as a result of your active lifestyle or a sports injury? It maybe so. But among many other conditions, knee pain in young adults can be a sign of arthritis. What is Arthritis? Arthritis is a term used to describe inflammation of the synovial (fluid filled) joints. It is a common condition that affects people of all ages, genders, and races. There are over 100 different types of arthritis, with osteoarthritis and rheumatoid arthritis being the most common ones. Osteoarthritis is caused by...