Remember that each disc is like a jelly doughnut — a tough outer ring with a soft center. A herniated disc happens when the soft center pushes through a weak spot or tear in the outer ring. If that material presses on a nearby nerve, it can cause pain, numbness, or weakness. Herniated discs are most common in the lower back and neck.
You may see these words on your MRI report — they describe how far the disc material has moved, from mild to more advanced:
- Bulging disc: The disc evenly spreads beyond its normal edge (like a burger patty too wide for the bun). The outer ring is intact. Not a true herniation, and very common even without pain.
- Protrusion: A focused bump pushes out in one spot; the outer ring is stretched but not torn through.
- Extrusion: The soft center pushes through the ring, and the escaped part is larger than the opening (like toothpaste squeezed partway out).
- Sequestration: A piece breaks completely free as a loose fragment in the canal.
The larger, more dramatic herniations (extrusions and sequestrations) are often the ones most likely to shrink and disappear on their own. When disc material escapes into the canal, the body recognizes it as "out of place" and clears it away. Most herniated discs get smaller or resorb within several months to a year — with no surgery.
Symptoms
- Pain that radiates from the spine into an arm (neck) or down a leg (lower back) — often worse than the back or neck pain itself.
- Numbness or tingling in a specific part of the arm, hand, leg, or foot.
- Weakness in certain muscles; pain worse with coughing, sneezing, or straining.
How it's diagnosed
A detailed history and physical exam (testing strength, reflexes, sensation, and often a "straight leg raise"). MRI is the best test to confirm it — though imaging usually isn't needed right away, because most people improve on their own.
Non-surgical treatment
Most people get better without surgery: staying active (bed rest doesn't help), anti-inflammatory and pain medicines, physical therapy, and sometimes epidural steroid injections to calm the irritated nerve.
When surgery is considered
Usually only after a reasonable trial of non-surgical care (around 6 weeks or more), or sooner for significant or worsening weakness. The most common operation is a microdiscectomy through a small incision; for neck herniations, ACDF is common. Surgery tends to relieve arm or leg pain faster, but by one to two years out, many who chose non-surgical care do well too. When surgery is chosen, its main benefit is faster relief. It's rarely an emergency, and taking time to decide usually doesn't change the long-term result.
You develop loss of bladder or bowel control, numbness in the "saddle" area (groin, buttocks, inner thighs), or rapidly worsening weakness in both legs.
About sciatica
Sciatica is the common name for pain that shoots from the low back down the leg when a nerve root is pinched or irritated, most often by a herniated disc. The medical term is lumbar radiculopathy.