Back pain is one of the most common types of pain that motivates people to consider physical therapy. In fact, lower back pain is so common that one out of four Americans reports having had at least some of it at some point in the last three months. Most of the time, it's mild and goes away on its own, but when it's chronic, it's best to consult a professional.
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In fact, if your lower back pain is ever accompanied by the loss of bladder control or numbness in your groin, then you should head straight to the ER. It could be that the end of your spinal cord is getting squeezed.
While much lower back pain isn't an emergency, it can run the gamut of severity. It's technically defined as "chronic" when it has persisted for more than three months. ("Acute" is less than three months.) If it comes back, it's called, "recurrent." Most people with acute lower back pain suffer at least one recurrence.
The bottom line here is that if your pain lasts for more than a few days, or if it gets worse, then you should see a physical therapist so that he or she can at least perform an evaluation. While you're waiting for your appointment, you should try to stay as active as you can. Too much bed rest can actually slow down your recovery.