. >> reporter: the american college of rheumatology says two-thirds of women ag50 and older have a degreeof knee pain, it may come and go or stick around. osteoarthritis is often to blame. >> we think estrogen may have a protective effect on the cartilage of the knee. >> reporter: sometimes due to overuse injuries. see your primary doctors to start determining the cause. he or she may need to send you to a specialist. discuss anti-inflammatory medications and don't forget to use exercise as meds sin, do exercise that strengthens the muscles around the knee and you may need physical therapy. avoid high impact exercises, focus on low impact ones. weight is also a leading cause of knee pain. i'm elizabeth cohen. >>> let's start off with a check of the most powerful radar. five sweeps scanning all clear. conditions absolutely different than yesterday when we had snowy weather. let's take you north, all eyes focused on foxboro, sunday night, clear conditions in foxboro today for ravens fans traveling in that direction, bright and cold conditions here, at the stadium. they are testing tout jumb