What is the difference between cracking and adjusting?

People often use "cracking" to describe what happens during a chiropractic appointment, but the term conflates a sound with the actual treatment. The cracking or popping noise is cavitation, a byproduct that occurs when gas bubbles form and collapse in joint fluid as a chiropractor applies pressure to mobilize a restricted spinal segment. This sound is incidental, not the goal.

An adjustment (or spinal manipulation) is the deliberate clinical movement a chiropractor performs to restore motion to a joint that has become stuck or misaligned, a condition chiropractors call a subluxation. The adjustment applies controlled force to vertebrae or other joints. Whether or not an audible crack occurs does not determine whether an adjustment was effective. Some patients hear nothing, while others produce obvious popping sounds. The outcome depends on the restoration of joint function, not the noise.

This distinction matters because it clarifies what chiropractors actually do. Patients sometimes mistake the absence of cracking for an ineffective treatment, or assume all effective adjustments must produce sound. Understanding that adjusting is the therapeutic action and cracking is merely an acoustic side effect helps set realistic expectations for chiropractic sessions, particularly in Klang Valley clinics where treatment approaches may vary.