“New research by University of Manchester scientists has for the first time shown that our spinal discs have 24-hour body clocks which when they malfunction, can contribute to lower back pain.”
Michal Dudek et al. The intervertebral disc contains intrinsic circadian clocks that are regulated by age and cytokines and linked to degeneration, Annals of the Rheumatic Diseases (2016). DOI: 10.1136/annrheumdis-2016-209428