Researchers have established that changes in barometric pressure and other weather conditions, affect inflammation and joint pain. These changes can aggravate pain in these joints. Inflamed osteoarthritic joints, including neck, back, and extremities, have edema in the surrounding joint that contracts or expands in a minute amount but enough to decrease or increase pain. Stormy weather represents low atmospheric pressure increasing joint expansion and pain while sunny weather, high pressure, contacts the joint edema, decreasing pain. Similarly a blown up ballon will expand the higher it rises and contract the lower it descends.