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Psoriatic arthritis most often causes swelling and joint pain in the fingers and toes. Aortic stenosis Aortic stenosis is a condition of the heart causing shortness of breath, dizziness, or chest pain.
The noise that is generated when you crack your knuckles (or neck or back) is due to a phenomenon called cavitation. Basically, what happens is that when you move your joints quickly, the fluid inside the joint space is displaced, creating a small vacuum which causes little bubbles to form. These bubbles quickly burst, causing the popping noise.