Chiropractors are trained in using manipulation to free still or restricted joints. These can also be called 'adjustments' or 'manual therapy'. Manipulation involves the chiropractor using their hands to apply quick, precise thrusts to the restricted joints. During manipulation there may be popping sounds (similar to the 'crack' heard when people flex their knuckles). This is quite harmless. It is just the sound of gas bubbles popping in the fluid of the joints as pressure is released.
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