Go to an emergency department now for loss of bladder or bowel control, trouble passing urine, or numbness in the groin, inner thighs or buttocks. That can be cauda equina syndrome, a surgical emergency. Get prompt care too for leg weakness that is getting worse, fever with back pain, back pain after a significant fall or accident, or new back pain with a history of cancer or unexplained weight loss.

How long it usually lasts

Low back pain is the leading cause of disability worldwide, and almost all of it is "nonspecific," meaning no serious disease is behind it and no single structure can be pinned down as the source.2 That sounds unsatisfying. It is actually good news: your back is not broken.

  • The first six weeks. Pain is usually worst at the start and improves markedly, from an average of 52 to 23 out of 100.1
  • Six weeks to six months. Improvement continues more slowly, to about 12 out of 100 at 26 weeks on average.1
  • If it has already lasted months. Recovery is slower. People who started with persistent pain averaged 51 out of 100 at the start and were still at 23 a year later.1

It also tends to come back. The best single study of recurrence found about one in three people had another episode within a year, and a previous episode was the one factor that consistently predicted the next.3 That is why the plan should not stop when the pain does.

Your MRI is probably scarier than your back

A review pooling imaging from 3,110 people with no back pain at all found disc degeneration in 37 percent of 20-year-olds and 96 percent of 80-year-olds, and disc bulges in 30 percent of 20-year-olds and 84 percent of 80-year-olds.4 None of those people hurt. Many of the words on an MRI report describe normal aging. That is why guidelines advise against routine imaging for recent low back pain,5 and why imaging usually waits for red flags, worsening nerve symptoms, or about six weeks without progress.

What actually helps

  • Keep moving. Bed rest is not the answer. Guidelines consistently recommend staying active, understanding what is going on, and supervised exercise.5
  • Hands-on care, with honest expectations. A JAMA meta-analysis found spinal manipulation gave modest improvements in pain and function for acute low back pain up to six weeks, with temporary soreness as the usual side effect.6 The American College of Physicians lists it among recommended non-drug options.7 I treat it as one part of an active plan, not the whole plan.
  • Build what protects you. Walking, core endurance, and hip and glute strength, and keep doing them after the pain settles, because recurrence is common.
  • Mind the things that keep pain going. High early pain, stress and fear of movement raise the risk that back pain becomes persistent.2 Learning that hurt does not always mean harm is part of the treatment.

Common questions

Do I need an MRI for low back pain?

Usually not in the first four to six weeks, unless there are red flags, worsening weakness or numbness, a significant injury, or a concern about infection or cancer. Disc bulges show up in many people who have no pain.

Should I rest or stay active with back pain?

Stay active. Bed rest is not recommended. Gentle, gradually increasing movement is the foundation of recovery.

How long does lower back pain take to heal?

Most new episodes improve markedly within six weeks and keep improving more slowly after that. Pain that has already lasted months tends to improve more slowly and benefits from a broader plan.