human
I've been having a lot of pain in my lower back lately. What is the cause?
assistant
The most common cause of lower back pain is muscle strain or sprain, which can occur when you overexert yourself or lift something too heavy. Other causes include arthritis, spinal stenosis (a narrowing of the spinal canal), and disc herniation. It's important to see a doctor if your lower back pain lasts more than two weeks or becomes severe.