Different diseases and ailments were more common in prehistory than today; there is evidence that many people suffered from osteoarthritis, probably caused by the lifting of heavy objects which would have been a daily and necessary task in their societies. For example, the transport of latte stones, though this practice only started during the neolithic era which involved hyper extension and torque of the lower back, while dragging the stones, may have contributed to the development of micro fractures in the spine and subsequent spondylolysis.