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The pain can be caused by the discâs location in relation to the nerve or by the molecules that are released by the inner layer as it bulges outward. Intervertebral discs in the neck or lower back are most at risk for disc bulging. When discs bulge in the neck, chronic pain may occur in the neck, head, or face. Additionally, chronic pain may also be felt in the shoulders, arms, or fingers. When discs bulge in the low back, chronic pain may occur in the lower back, pelvis, or buttocks. Additionally, chronic pain may also be felt in the legs, feet, or toes. Numbness and tingling may also occur when a bulging disc is present.
from 14% to 100% of the flight. Twenty-eight percent of crewmembers described the back pain quality as moderate to severe in intensity6. The exact pathogenesis of back pain with microgravity exposure is unknown, but available studies strongly indicate that the pliable intervertebral disc is the most likely pain generator4-5. Terrestrial low back pain may precede more debilitating conditions such as a herniated nucleus pulposus (HNP).