Why Do Your Knees Pop When You Bend Over to Pick Something Up?

Every once in awhile, one of my knees will "pop". Sometimes, I can even crack my knees (like cracking your knuckles.) Does that ever happen to you? Is it dangerous?

Not dangerous if it doesn't cause you pain, according to an article in the Jan/Feb issue of Womans health Magazine. The sound you hear is due to natural wear and tear of your knees cartilage. It could also be the onset of early arthritis. If you have pain or swelling however, it's time to see your orthopedist.