You may attribute a sensation of weakness to many potential causes. Should the symptom continue beyond a few days or become extremely acute, contact your doctor or an emergency medical provider immediately.

Most runners experience knee pain at some point, particularly if they run on hard surfaces like concrete and asphalt. Much of this pain has to do with the high-impact nature of running, which sends shockwaves up the lower body and compresses bone and cartilage against one another.

Knee pain is a symptom frequently associated with the development of rheumatoid arthritis and osteoarthritis. Individuals with these disorders sometimes report increases or decreases in their pain levels that appear to be associated with changes in local weather conditions.

Much like the god Atlas of Greek mythology, the job of the knee joint is to bear weight. As a weight bearer, the knee is subject to athletic, overuse and arthritic injury.