A storage bin needs to return to its spot on the top shelf of your closet. No problem, right? It just weighs a few pounds. So you grab the bin by the handles, start to lift it over your head and - YOWZA! - a sharp pain stabs at your shoulder.
Consider that an unwelcome introduction to shoulder bursitis, a painful inflammation in the joint most often brought on by overuse or injury. The wear and tear of daily life can make this a chronic condition, too.