Why would your knees crack and pop all the time?

Popping or cracking knuckles is a result of releasing gas out of a pocket of liquid in your joints (if I remember correctly). Basically, it's kind of like opening a can of soda. It isn't harmful and contrary to popular opinion doesn't cause Arthritis

Knees, on the other hand, usually pop because of ligaments snapping over bony protrusions. This again is harmless unless you're really twisting your kness.

Why it would happen "all the time" depends on how often you're talking about, but my knees crack and pop at least 5 - 10 times a day, and it's considered normal for me.

More information:

I get that all the time. I will stretch my leg and my knee will crack. I will start jogging and my knees will crack. I can be sitting down and flexing my leg and they will just continually crack.

It's probably a ligament going over or hitting a bone. But I like the satisfaction of a loud crack that comes from the knee; it's pretty cool.

When my knees would crack it was the begining of osteoarthritis of the knees. My knees have been getting worse over a period of years and now are very bad. I suggest you go to the doctor and get a X-Ray so you know what you are looking at. If indeed it is arthritis, it will be helpful to know the things you can do to help protect your knees, because when they are gone, they are gone.

There a certain fluid in your joints that when you make a certain movement, releases pressure, and creates bubbles that pop. usually, you can only crack a joint every thirty minutes, because the fluid has to to reform. My knees crack continuously due to a certain syndrome. If I lie down, and bend my legs back and forth, there is constant cracking, about every two seconds.