Picture: Lower back pain can be related to problems with the spine (spinal chord), discs, ligaments, muscles, nerves, internal organs and skin.
Low Back Pain

Lower Back Pain
(Lumbar Back Pain)

Medical Author:
Medical Editor:

Low back pain facts

  • Functions of the low back, or lumbar area, include structural support, movement, and protection of certain body tissues.
  • Pain in the low back can relate to the bony lumbar spine, discs between the vertebrae, ligaments around the spine and discs, spinal cord and nerves, muscles of the low back, internal organs of the pelvis and abdomen, and the skin covering the lumbar area.
  • Treatment of low back pain is optimally directed toward a diagnosed or suspected specific cause. For acute lumbar strain, use of a home remedy initially can be beneficial.

What is the anatomy of the low back?

The first step to understanding low back pain is appreciating the normal design (anatomy) of the tissues of this area of the body. Important structures of the low back that can be related to symptoms in this region include the bony lumbar spine (vertebrae, singular = vertebra), discs between the vertebrae, ligaments around the spine and discs, spinal cord and nerves, muscles of the low back, internal organs of the pelvis and abdomen, and the skin covering the lumbar area.

The bony lumbar spine is designed so that vertebrae "stacked" together can provide a movable support structure while also protecting the spinal cord from injury. The spinal cord is composed of nervous tissue that extends down the spinal column from the brain. Each vertebra has a spinous process, a bony prominence behind the spinal cord, that shields the cord's nervous tissue from impact trauma. Vertebrae also have a strong bony "body" (vertebral body) in front of the spinal cord to provide a platform suitable for weight bearing of all tissues above the buttocks. The lumbar vertebrae stack immediately atop the sacrum bone that is situated in between the buttocks. On each side, the sacrum meets the iliac bone of the pelvis to form the sacroiliac joints of the buttocks.

The discs are pads that serve as "cushions" between the individual vertebral bodies. They help to minimize the impact of stress forces on the spinal column. Each disc is designed like a jelly donut with a central, softer component (nucleus pulposus) and a surrounding, firm outer ring (annulus fibrosus). The central portion of the disc is capable of rupturing (herniating as in a herniated disc) through the outer ring, causing irritation of adjacent nervous tissue and sciatica as described below. Ligaments are strong fibrous soft tissues that firmly attach bones to bones. Ligaments attach each of the vertebrae to each other and surround each of the discs.

The nerves that provide sensation and stimulate the muscles of the low back as well as the lower extremities (the thighs, legs, feet, and toes) all exit the lumbar spinal column through bony portals, each of which is called a "foramen."

Many muscle groups that are responsible for flexing, extending, and rotating the waist, as well as moving the lower extremities, attach to the lumbar spine through tendon insertions.

The aorta and blood vessels that transport blood to and from the lower extremities pass in front of the lumbar spine in the abdomen and pelvis. Surrounding these blood vessels are lymph nodes (lymph glands) and tissues of the involuntary nervous system that are important in maintaining bladder and bowel control.

The uterus and ovaries are important pelvic structures in front of the pelvic area of women. The prostate gland is a significant pelvic structure in men. The kidneys are on either side of the back of the lower abdomen, in front of the lumbar spine.

The skin over the lumbar area is supplied by nerves that come from nerve roots that exit from the lumbar spine.

Reviewed by Melissa Conrad Stöppler, MD on 3/12/2012


Patient Comments

Viewers share their comments

Lower Back Pain - Common Causes Question: What is the cause of or reason for your lower back pain?
Lower Back Pain - Uncommon Causes Question: Do you have an unusual reason for lower back pain? Please discuss the cause.
Lower Back Pain - Prevention Question: In what ways do you try to prevent lower back pain? Please describe conditioning programs.
Lower Back Pain - Effective Treatments Question: What kinds of treatment have been effective for your lower back pain?
Lower Back Pain - Exercises Question: What stretches and exercises have helped with your lower back pain?

Low Back Pain Treatment

10 Ways to Manage Low Back Pain at Home

By Stephanie Watson
WebMD Feature

Reviewed by Louise Chang, MD

Perhaps you bent the wrong way while lifting something heavy. Or you're dealing with a degenerative condition like arthritis. Whatever the cause, once you have low back pain, it can be hard to shake. About one in four Americans say they've had a recent bout of low back pain. And almost everyone can expect to experience back pain at some point in their lives.

Sometimes it's clearly serious: You were injured, or you feel numbness, weakness, or tingling in the legs. Call the doctor, of course. But for routine and mild low back pain, here are a few simple tips to try at home. 

Chill it. Ice is best in the first 24 to 48 hours after an injury because it reduces inflammation, says E. Anne Reicherter, PhD, PT, DPT, associate professor of Physical Therapy at the University of Maryland School of Medicine. "Even though the warmth feels good because it helps cover up the pain and it does help relax the muscles, the heat actually inflames the inflammatory processes," she says. After 48 hours, you can switch to heat if you prefer. Whether you use heat or ice -- take it off after about 20 minutes to give your skin a rest. If pain persists, talk with a doctor.

Get the latest health and medical information delivered direct to your inbox FREE!