Sciatica is a type of back pain that affects the sciatic nerve. The sciatic nerve is a large nerve that exits from the spine in the area of the low back, travels down to the buttock and continues down along the back of the thighs into the feet. It is an important nerve that branches in several places in the legs and provides nerve innervation to the legs and feet.  A disc in the spine can herniate and compress the sciatic nerve causing symptoms of sciatica.

Symptoms

Patients with sciatica usually experience the familiar electric jolt like sensation propagating along the back of the thighs sometimes all the way to the feet. The sensation of pins and needles or ants crawling under the skin of the legs is also frequently described by patients experiencing sciatica. The intensity of the pain varies among the patients. Some individuals experience excruciating debilitating pain that causes them to become bedridden for a couple of days, while others have only mild pain in their back and legs. While the sciatic pain usually starts in the low back and continues down the leg along the path of the sciatic nerve, the pain is usually more intense in the legs than in the back. Sciatica generally affects only one leg at a time. It is rare to see the involvement of both legs at the same time. If this is the case, it is important to seek medical evaluation to rule out other causes for these symptoms.

Most patients complain of more significant pain when they sit down. Standing for extended periods of time is also very painful and most people prefer to lay down or slowly walk around to ease their pain. Numbness and weakness in the leg are also frequently associated with sciatica. If the sciatic nerve becomes compressed in the buttock by a muscle called piriformis, it is called piriformis syndrome. The main differentiating symptoms between sciatica and the piriformis syndrome is that painful sensation caused by piriformis syndrome propagates down the leg along the back of the thighs and only up to the knees and not past the knees. The quality of the pain is also different. Pain radiating down the legs due to the Piriformis Syndrome generally feels like a dull, achy sensation unlike the electric-like, burning sensation caused by a pinched nerve in the spine causing sciatica.

Causes

There are many reasons why someone may develop sciatica. The risk factors are similar to developing any back pain. The excessive weight which creates too much pressure on the spine, sedentary occupation with lack of movement or carrying heavy objects are some of the most important causes. Aging is an independent factor that compounds any of the above risk factors because most people become more sedentary as they get older, gain weight and become less flexible. Sciatica is however not exclusive of young healthy individuals. Many individuals in the 30s present to their health care provider’s office with symptoms of sciatica after sustaining injury from doing exercises at the gym. This is usually related to lifting heavy weights, not stretching before and after exercising, as well as not getting enough rest to allow body fully recover and regenerate.  To prevent flare-ups of sciatica it is, therefore, crucial to maintaining healthy weight and stay mobile.

Treatment Guidelines

While sciatica can be rarely caused by a bone spur or a tumor, in most cases of sudden onset of sciatica, it is related to a disc herniation.  The treatment for sciatica is therefore essentially the same as for disc herniation since both share the same underlying cause. Treatment guidelines for disc herniation can be found here.

Symptoms

Electric jolt like sensation in the back & back of the leg

“Pins and needles” sensation

Numbness and weakness in the leg

Burning sensation

Affects usually only one leg

More pain with sitting or standing

Pain is better when laying down or walking slowly

Causes

Excessive weight

Sedentary occupation & lack of movement

Carrying heavy objects

Advanced age

Lifting heavy weights