Posterior bulge of L4-L5 intervertebral.

My husband is suffering from back pain since last 8-10 days. He has no other symptoms - No tingling or numbness in his legs. He is able to walk with or without pain. He is corporate professional and his job requires him to sit for long duration through out the day. 9 months back, due to an accident, he had PCL reconstruction surgery which is fine now. That accident didn't cause any issue with his spine as per detailed tests done during that time. It only impacted his right knee. Below is the result from MRI scan- Impression -Posterior disc bulges of L2-L3, L3-L4 and L5-S1 intervertebral discs, however not causing any significant thecal sac or nerve root compression. -Posterior bulge of L4-L5 intervertebral disc with indentation of bilateral traversing nerve roots. What is the above condition and is this serious? Is there non surgical treatment available?