Hidden pain in the right side of the lower back may be related to lumbar disc herniation, lumbar muscle strain, acute lumbar sprain, ankylosing spondylitis, and some internal diseases. 1. Herniated lumbar intervertebral disc: when the symptoms of herniated lumbar intervertebral disc are mild, the compression of nerve root is not obvious, and it can be manifested as vague pain and soreness in the right lumbar back, and the general numbness is not obvious. 2. Lumbar muscle strain: right lumbar muscle strain can cause chronic inflammation of the lumbar muscle, which can also cause vague pain in the right side of the lower back. It can be significantly reduced after rest. 3. Acute lumbar sprain: Improper exertion when bending down may cause acute lumbar sprain, resulting in vertebral small joint disorders, which may also cause vague pain in the right lumbar region. 4. Ankylosing spondylitis: when ankylosing spondylitis encroaches on the lumbar spine, it will affect the activities of the lumbar spine and cause symptoms of hidden pain in the lower back. 5. Some internal diseases: such as cholecystitis, gallbladder stones, urinary stones, etc. will also radiate to the right side of the lower back and cause vague pain. There are many reasons that lead to the hidden pain in the right side of the lower back, it is recommended that the patient go to the hospital for medical examination to clarify the cause of the disease and then carry out regular treatment.