You’d think so. But consider this story of a motorcycle accident: many years ago, a friend hit a car that had pulled out from a side street. He flew over the car & landed on his head. Bystanders showed their ignorance of spinal fracture by, yikes, carelessly moving him. In fact, his thoracic spine was significantly fractured … yet the hospital actually refused to do an X-ray because he had no obvious symptoms of a spinal fracture. Incredible! The next day, a horrified orthopedic surgeon ordered an X-ray immediately, confirming the fracture & quite possibly saved him from paralysis.
The side of the pain on its own doesn’t tell us much, and most of the one-sided sources of pain are viscera that usually cause abdominal pain instead of back pain, or in addition to it. In other words, the only reason to worry about right or left lower back pain is if it is otherwise worrisome: if you have other red flags or significant non-back symptoms.
A sedentary lifestyle can lead to having weak and tight hip flexors as they are always in the shortened position. Tight hip flexors can lead to a limited range of motion, poor posture, lower back and hip pain, and even injuries. These muscles need to get a workout when you are standing and doing movements such as raising your leg to climb stairs, run, or ride a bicycle.