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Sciatica

Neuropathy - sciatic nerve; Sciatic nerve dysfunction; Low back pain - sciatica; LBP - sciatica; Lumbar radiculopathy - sciatica

 

Sciatica refers to pain, weakness, numbness, or tingling in the leg. It is caused by injury to or pressure on the sciatic nerve. Sciatica is a symptom of a medical problem. It is not a medical condition on its own.

Causes

 

Sciatica occurs when there is pressure or damage to the sciatic nerve. This nerve starts in the lower back and runs down the back of each leg. This nerve controls the muscles of the back of the knee and lower leg. It also provides sensation to the back of the thigh, part of the lower leg, and the sole of the foot.

Common causes of sciatica include:

  • Slipped disk
  • Spinal stenosis
  • Piriformis syndrome (a pain disorder involving the narrow muscle in the buttocks)
  • Pelvic injury or fracture
  • Tumors

Men between 30 and 50 years of age are more likely to have sciatica.

 

Symptoms

 

Sciatica pain can vary widely. It may feel like a mild tingling, dull ache, or burning sensation. In some cases, the pain is severe enough to make a person unable to move.

The pain most often occurs on one side. Some people have sharp pain in one part of the leg or hip and numbness in other parts. The pain or numbness may also be felt on the back of the calf or on the sole of the foot. The affected leg may feel weak. Sometimes, your foot gets caught on the ground when walking.

The pain may start slowly. It may get worse:

  • After standing or sitting
  • During certain times of the day, such as at night
  • When sneezing, coughing, or laughing
  • When bending backward or walking more than a few yards or meters, especially if caused by spinal stenosis

 

Exams and Tests

 

The health care provider will perform a physical exam. This may show:

  • Weakness when bending the knee
  • Difficulty bending the foot inward or down
  • Difficulty walking on your toes
  • Difficulty bending forward or backward
  • Abnormal or weak reflexes
  • Loss of sensation or numbness
  • Pain when lifting the leg straight up when you're lying on the exam table

Tests are often not needed unless pain is severe or long-lasting. If tests are ordered, they may include:

  • Blood tests
  • X-ray, MRI, or other imaging tests

 

Treatment

 

As sciatica is a symptom of another medical condition, the underlying cause should be identified and treated.

In some cases, no treatment is required and recovery occurs on its own.

Conservative (non-surgical) treatment is best in many cases. Your provider may recommend the following steps to calm your symptoms and reduce inflammation:

  • Apply heat or ice to the painful area. Try ice for the first 48 to 72 hours, then use heat.
  • Take over-the-counter pain relievers such as ibuprofen (Advil, Motrin IB) or acetaminophen (Tylenol).

Measures to take care of your back at home may include:

  • Bed rest is not recommended.
  • Reduce your activity for the first couple of days. Then, slowly start your usual activities.
  • DO NOT do heavy lifting or twisting of your back for the first 6 weeks after the pain begins.
  • Start exercising again after 2 to 3 weeks. Include exercises to strengthen your abdominal (core) muscles and improve flexibility of your spine.

Your provider may also suggest physical therapy. Additional treatments depend on the condition that is causing the sciatica.

If these measures do not help, your provider may recommend injections of certain medicines to reduce swelling around the nerve. Other medicines may be prescribed to help reduce the stabbing pains due to nerve irritation.

Nerve pain is very difficult to treat. If you have ongoing problems with pain, you may want to see a neurologist or a pain specialist to ensure that you have access to the widest range of treatment options.

 

Outlook (Prognosis)

 

Often, sciatica gets better on its own. But it is common for it to return.

 

Possible Complications

 

More serious complications depend on the cause of sciatica, such as slipped disk or spinal stenosis. Sciatica can lead to permanent numbness or weakness of your leg.

 

When to Contact a Medical Professional

 

Call your provider right away if you have:

  • Unexplained fever with back pain
  • Back pain after a severe blow or fall
  • Redness or swelling on the back or spine
  • Pain traveling down your legs below the knee
  • Weakness or numbness in your buttocks, thigh, leg, or pelvis
  • Burning with urination or blood in your urine
  • Pain that is worse when you lie down, or awakens you at night
  • Severe pain and you cannot get comfortable
  • Loss of control of urine or stool (incontinence)

Also call if:

  • You have been losing weight unintentionally (not on purpose)
  • You use steroids or intravenous drugs
  • You have had back pain before, but this episode is different and feels worse
  • This episode of back pain has lasted longer than 4 weeks

 

Prevention

 

Prevention varies, depending on the cause of the nerve damage. Avoid prolonged sitting or lying with pressure on the buttocks.

 

 

References

Kim DH, Hudson AR, Kline DG. Sciatic nerve. In: Kim DH, Hudson AR, Kline DG, eds. Atlas of Peripheral Nerve Surgery. 2nd ed. Philadelphia, PA: Elsevier Saunders; 2013:chap 16.

Marques DR, Carroll WE. Neurology. In: Rakel RE, Rakel DP, eds. Textbook of Family Medicine. 9th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 41.

Ropper AH, Zafonte RD. Sciatica. N Engl J Med. 2015;372(13):1240-1248. PMID: 25806916 www.ncbi.nlm.nih.gov/pubmed/25806916.

 
  • Sciatica

    Sciatica

    Animation

  •  

    Sciatica - Animation

    Sciatica. It's not a new trendy restaurant in New York or LA, or a new SciFi program on your favorite cable channel. Sciatica is something much less sexy. Sciatica might actually be the cause of that the sharp pain you occasionally feel in your backside, or traveling down your hip or leg. What is sciatica? What does this pain mean? Sciatica occurs when there is pressure or damage to the Sciatic nerve. This large nerve starts in your lower spine and runs down the back of each leg. It controls the muscles of the back of your knee and lower leg. It also provides sensation to the back of your thigh, part of your lower leg, and the sole of your foot. Sciatica is usually caused by another problem, such as a slipped disk, spinal stenosis or narrowing of the spinal column, piriformis syndrome, the narrowing of muscle in your buttocks, a pelvic injury or fracture, and perhaps even tumors. Your pain may feel like a mild tingling, a dull ache, or a burning sensation. Sometimes the pain can be so bad you might not be able to move. The pain will usually occur on one side, perhaps as a sharp pain in one part of your hip or leg, or maybe you will notice the numbness. The pain may get worse after you stand or sit, at night, when you sneeze, cough, or laugh, or when you bend backwards or walk forward. For treatment, your doctor will perform a careful physical exam. Your doctor might find you have weakness when you bend your knee or move your foot, trouble bending your foot inward or downward, weak reflexes, or pain when you lift your leg straight up off the examination table while lying down. Your doctor may also do other tests to find what's causing your sciatica, including blood tests, x-rays, and other imaging tests. Treatment will focus on what causes your sciatica. Sometimes you may not need treatment because your pain will go away on its own. Your doctor will likely first recommend that you take steps to calm your symptoms and reduce inflammation, such as applying heat or ice to the painful area. You might try ice for the first 48 to 72 hours after you feel pain, then use heat afterwards. Your doctor might also tell you to take over-the-counter pain relievers. If conservative measures don't help your problem, your doctor may recommend you have injections to reduce inflammation around your sciatic nerve and other medicines to reduce the stabbing pain. Physical therapy may be a viable option, so talk to your healthcare provider about this option. Whatever you do, don't stay in bed all day. You need to reduce your normal activity for the first few days after you start having pain, but getting no activity will only make your pain worse. After a few days, try gradually returning to your normal routine. But, avoid heavy lifting or twisting your back for at least 6 weeks. Make sure you start exercising again though after 2 to 3 weeks. Remember, include exercises to strengthen your abdomen or belly and improve the flexibility of your spine.

  • Sciatic nerve

    Sciatic nerve - illustration

    The main nerve traveling down the leg is the sciatic nerve. Pain associated with the sciatic nerve usually originates higher along the spinal cord when nerve roots become compressed or damaged from narrowing of the vertebral column or from a slipped disk. Symptoms can include tingling, numbness, or pain, which radiates to the buttocks legs and feet.

    Sciatic nerve

    illustration

  • Cauda equina

    Cauda equina - illustration

    The spinal cord ends in the lumbar area and continues through the vertebral canal as spinal nerves. Because of its resemblance to a horse's tail, the collection of these nerves at the end of the spinal cord is called the cauda equina. These nerves send and receive messages to and from the lower limbs and pelvic organs.

    Cauda equina

    illustration

  • Sciatic nerve damage

    Sciatic nerve damage - illustration

    The sciatic nerve is located in the back of the leg. It supplies the muscles of the back of the knee and lower leg. The sciatic nerve also provides sensation to the back of the thigh, part of the lower leg, and the sole of the foot. Partial damage to the nerve may demonstrate weakness of knee flexion (bending), weakness of foot movements, difficulty bending the foot inward (inversion), or bending the foot down (plantar flexion). A person's reflexes may be abnormal, with weak or absent ankle-jerk reflex. Several different tests can be performed to find the cause of sciatic nerve dysfunction.

    Sciatic nerve damage

    illustration

  • Sciatica

    Animation

  •  

    Sciatica - Animation

    Sciatica. It's not a new trendy restaurant in New York or LA, or a new SciFi program on your favorite cable channel. Sciatica is something much less sexy. Sciatica might actually be the cause of that the sharp pain you occasionally feel in your backside, or traveling down your hip or leg. What is sciatica? What does this pain mean? Sciatica occurs when there is pressure or damage to the Sciatic nerve. This large nerve starts in your lower spine and runs down the back of each leg. It controls the muscles of the back of your knee and lower leg. It also provides sensation to the back of your thigh, part of your lower leg, and the sole of your foot. Sciatica is usually caused by another problem, such as a slipped disk, spinal stenosis or narrowing of the spinal column, piriformis syndrome, the narrowing of muscle in your buttocks, a pelvic injury or fracture, and perhaps even tumors. Your pain may feel like a mild tingling, a dull ache, or a burning sensation. Sometimes the pain can be so bad you might not be able to move. The pain will usually occur on one side, perhaps as a sharp pain in one part of your hip or leg, or maybe you will notice the numbness. The pain may get worse after you stand or sit, at night, when you sneeze, cough, or laugh, or when you bend backwards or walk forward. For treatment, your doctor will perform a careful physical exam. Your doctor might find you have weakness when you bend your knee or move your foot, trouble bending your foot inward or downward, weak reflexes, or pain when you lift your leg straight up off the examination table while lying down. Your doctor may also do other tests to find what's causing your sciatica, including blood tests, x-rays, and other imaging tests. Treatment will focus on what causes your sciatica. Sometimes you may not need treatment because your pain will go away on its own. Your doctor will likely first recommend that you take steps to calm your symptoms and reduce inflammation, such as applying heat or ice to the painful area. You might try ice for the first 48 to 72 hours after you feel pain, then use heat afterwards. Your doctor might also tell you to take over-the-counter pain relievers. If conservative measures don't help your problem, your doctor may recommend you have injections to reduce inflammation around your sciatic nerve and other medicines to reduce the stabbing pain. Physical therapy may be a viable option, so talk to your healthcare provider about this option. Whatever you do, don't stay in bed all day. You need to reduce your normal activity for the first few days after you start having pain, but getting no activity will only make your pain worse. After a few days, try gradually returning to your normal routine. But, avoid heavy lifting or twisting your back for at least 6 weeks. Make sure you start exercising again though after 2 to 3 weeks. Remember, include exercises to strengthen your abdomen or belly and improve the flexibility of your spine.

  • Sciatic nerve

    Sciatic nerve - illustration

    The main nerve traveling down the leg is the sciatic nerve. Pain associated with the sciatic nerve usually originates higher along the spinal cord when nerve roots become compressed or damaged from narrowing of the vertebral column or from a slipped disk. Symptoms can include tingling, numbness, or pain, which radiates to the buttocks legs and feet.

    Sciatic nerve

    illustration

  • Cauda equina

    Cauda equina - illustration

    The spinal cord ends in the lumbar area and continues through the vertebral canal as spinal nerves. Because of its resemblance to a horse's tail, the collection of these nerves at the end of the spinal cord is called the cauda equina. These nerves send and receive messages to and from the lower limbs and pelvic organs.

    Cauda equina

    illustration

  • Sciatic nerve damage

    Sciatic nerve damage - illustration

    The sciatic nerve is located in the back of the leg. It supplies the muscles of the back of the knee and lower leg. The sciatic nerve also provides sensation to the back of the thigh, part of the lower leg, and the sole of the foot. Partial damage to the nerve may demonstrate weakness of knee flexion (bending), weakness of foot movements, difficulty bending the foot inward (inversion), or bending the foot down (plantar flexion). A person's reflexes may be abnormal, with weak or absent ankle-jerk reflex. Several different tests can be performed to find the cause of sciatic nerve dysfunction.

    Sciatic nerve damage

    illustration

A Closer Look

 

Self Care

 

    Tests for Sciatica

     

       

      Review Date: 9/22/2016

      Reviewed By: C. Benjamin Ma, MD, Professor, Chief, Sports Medicine and Shoulder Service, UCSF Department of Orthopaedic Surgery, San Francisco, CA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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