 [ Symptoms ] i have lower back dull pain on right side of spine close to l4 l5 [ Disease ] in my opinion you have now multiple level disc lesion grade 2 and spondylitis grade 1 primary cause is doing abdominal exercise from extended hip and knee  must be both flexed to protect your back  you must stop heavy lifting and avoid jumping for 3 to 6 weeks start by 1 week bed rest in hip and knee 90 degree flextion use anti inflammatory 3 times a day then after one week start physical therapy program focused on back strechinggood luck