Weird sounds from your joints [duplicate]

Solution 1:

You can click (British English) or crack (British and American English) various joints in your body including your knuckles, knees and elbows.

• Clicking knuckles

  • Its owner clicked his knuckles nervously. (Terry Pratchett, Small Gods, 242)
  • Do you click your knuckles?

Here is an excerpt from the Wikipedia entry on Cracking Joints:

Cracking joints

The act of cracking human joints happens when joint manipulation in humans produce a sharp cracking or popping sound. This occurs during deliberate knuckle-cracking, and it is possible to crack many other joints, such as those in the back and neck vertebrae, hips, wrists, elbows, shoulders, toes, ankles, knees, jaws, feet, sternum, and the Achilles tendon area. The mechanism that produces the cracking sound was until recently unknown.[1]

According to a folk belief, the popping of joints, especially knuckles, leads to arthritis or other joint problems. However, medical research has so far failed to conclusively demonstrate any connection between knuckle cracking and long-term joint problems.

Joint cracking is one form of Crepitus