Atlas (C1 Vertebra)

Any trauma to the head or neck — including whiplash, direct head injury, or birth trauma — can shift the atlas out of position. The atlas bears the entire weight of the head and is responsible for more than 90% of all neck rotation. Part of the brain stem extends through both C1 and C2, making atlas misalignment directly adjacent to critical neural tissue rather than a purely mechanical joint problem. Lower back pain can originate from a misaligned atlas because a shift at C1 propagates compensatory tension down through every vertebral level. Atlas misalignment can generate symptoms that seem entirely unrelated to the neck, including headaches, tinnitus, nausea, digestive issues, and impaired breathing.