Low back strain-R side-occurred while pulling/jerking on pallet jack lodged under pallet, felt a sharp pulling in lower back. Not immediately reported, thought they could work through it. To medical first aid at 3PM (ice/massage/heat/biofreeze) advised rest on reg. sched. Days off. Sched. With MD on 11/05/2018 when pain cont/ Placed on light duty with pending f/u.