Sciatica is a form of radiculopathy caused by compression of the sciatic nerve, the large nerve that travels through the buttocks and extends down the back of the leg. This compression causes shock-like or burning low back pain combined with pain through the buttocks and down one leg, occasionally reaching the foot. In the most extreme cases, when the nerve is pinched between the disc and the adjacent bone, the symptoms may involve not only pain, but numbness and muscle weakness in the leg because of interrupted nerve signaling. The condition may also be caused by a tumor or cyst that presses on the sciatic nerve or its roots. 
The symptoms can also be classified by duration as acute, sub-chronic (also known as sub-acute), or chronic. The specific duration required to meet each of these is not universally agreed upon, but generally pain lasting less than six weeks is classified as acute, pain lasting six to twelve weeks is sub-chronic, and more than twelve weeks is chronic.[3] Management and prognosis may change based on the duration of symptoms.
Muscle Imbalances – The front of your hips, your hip flexors, are the muscles that will tighten and shorten while you are sitting for hours each day. While you are sitting, the back of your hips, your glutes and your hip extensors, are being overstretched. But just because they are being tightened and stretched respectively, doesn’t benefit either of them. They are also being weakened because of the lack of use of each muscle group.
You can strain or tear one or more of your hip flexors when you make sudden movements such as changing directions while running or kicking. Sports and athletic activities where this is likely to occur include running, football, soccer, martial arts, dancing, and hockey. In everyday life, you can strain a hip flexor when you slip and fall, for example. 
Imagine not being able to climb stairs, bend over, or even walk Changes in hip joint muscle-tendon lengths with mode of locomotion. Riley, P.O., Franz, J., Dicharry, J., et al. Center for Applied Biomechanics, University of Virginia, Charlottesville, VA. Gait & Posture, 2010 Feb; 31 (2): 279-83.. All pretty essential if you ask us! But that’s what our bodies would be like without our hip flexor muscles. Never heard of ‘em? It’s about time we share why they’re so important, how your desk job might be making them weaker (ah!), and the best ways to stretch them out.
Mechanical pain is often called back strain because it is linked with the movement, or "the mechanics" of the spine. This type of pain occurs when injury to the spine's discs, facet joints, ligaments, or muscles results in inflammation. It is called mechanical pain because it relates to the mechanics of your spine. The more you use your back, the more it hurts.
Im a skateboarder and a couple weeks ago i skated alot every day and my lefy hip was starting to get sore. But of course i couldnt resist skating so i kept skating and it got worse and worse to the point i couldnt really skate at all without my hip hurting but of course i would still mess around on the board doing tiny tricks but a couple days ago i was just skating around not really doing tricks and i slipped and kicked my leg out and REALLY hurt my hip and thought i tore a tendon or something and couldnt walk for two days, but its gotten alot better and i can walk fairly normal and i ice it everyday but whenever i stretch it its just a really sharp pain it doesnt feel like im stretching it. What do i do when all the stretch does is make a sharp pain? How do i strengthen my hip? And how long would it take to strengthen my hip to full strength again? Because i cant stand not being able to skate. Please reply so i can skate as soon as possible thank you
But moving is important for hip and knee OA. It causes your joints to compress and release, bringing blood flow, nutrients, and oxygen into the cartilage. “This can help prolong the function and longevity of your joints,” says Eric Robertson, DPT, a physical therapist and associate professor of clinical physical therapy at the University of Southern California.
However, even the things you do every day — like sitting in front of a computer or at a desk for hours — can both weaken and shorten (tighten) your hip flexors, making them more prone to injury. Because of this, exercises (such as squats) and targeted stretches which focus on strengthening the hip muscles and improving hip mobility are key to preventing injuries.
How to do it: Stand with your feet together, holding dumbbells by your sides. Take a wide step out to your right and lower into a side lunge, reaching dumbbells on either side of right leg [as shown]. Bend your left knee and shift your weight into both legs, into a wide squat position, reaching the dumbbells to floor in front of you, then extend your right leg and shift your weight to the left, moving into a side lunge with your left leg.
2016 — More editing, more! Added some better information about pain being a poor indicator, and the role of myofascial trigger points. This article has become extremely busy in the last couple months — about 4,000 readers per day, as described here — so I am really polishing it and making sure that it’s the best possible answer to people’s fears about back pain.
This Australian study concluded that “prognosis is moderately optimistic for patients with chronic low back pain,” contradicting the common fear that any low back pain that lasts longer than 6-9 weeks will become a long-term chronic problem. This evidence is the first of its kind, a rarity in low back pain research, a field where almost everything has been studied to death. “Many studies provide good evidence for the prognosis of acute low back pain,” the authors explain. “Relatively few provide good evidence for the prognosis of chronic low back pain.”
Congenital bone conditions: Congenital causes (existing from birth) of low back pain include scoliosis and spina bifida. Scoliosis is a sideways (lateral) curvature of the spine that can be caused when one lower extremity is shorter than the other (functional scoliosis) or because of an abnormal architecture of the spine (structural scoliosis). Children who are significantly affected by structural scoliosis may require treatment with bracing and/or surgery to the spine. Adults infrequently are treated surgically but often benefit by support bracing. Spina bifida is a birth defect in the bony vertebral arch over the spinal canal, often with absence of the spinous process. This birth defect most commonly affects the lowest lumbar vertebra and the top of the sacrum. Occasionally, there are abnormal tufts of hair on the skin of the involved area. Spina bifida can be a minor bony abnormality without symptoms. However, the condition can also be accompanied by serious nervous abnormalities of the lower extremities.
If you have hip pain, you may benefit from the skilled services of a physical therapist to help determine the cause of your pain. Your PT can work with you to develop a treatment strategy to treat your hip pain or hip discomfort. Understanding why your hip is hurting can help your physical therapist and doctor prescribe the right treatment regimen for your specific condition.
Traction involves the use of weights and pulleys to apply constant or intermittent force to gradually “pull” the skeletal structure into better alignment. Some people experience pain relief while in traction, but that relief is usually temporary. Once traction is released the back pain tends to return. There is no evidence that traction provides any longterm benefits for people with low back pain.
I’m not endorsing or saying these stretches are a miracle cure, but I definitely think they’ve helped. I’ve even started to add a few gentle yoga poses and pilates moves which I could so easily do, back in the day, when I was 63 kilos and participated in the greatest oxymoron ever named … a thing called the Fun Run. If I’m not careful, and I keep stretching away each day, I could end up with a 6 pack and back to my 5′ 7″ instead of 5′ 5″.
Spondylolisthesis. This condition occurs when one vertebra slips over the adjacent one. There are 5 types of spondylolisthesis but the most common are secondary to a defect or fracture of the pars (between the facet joints) or mechanical instability of the facet joints (degenerative). The pain can be caused by instability (back) or compression of the nerves (leg). 
Swimming is a low impact form of exercise that can help to relieve the pressure on your joints. It’s thought that water aerobics may help to reduce the impact on your joints by up to 75%!2 Be careful though; start with a beginner’s class and always do only what you’re comfortable with – try to avoid over-exercising or pushing your muscles too far!
A recent study from Florida Atlantic University found that doing 45 minutes of chair yoga twice per week reduced pain and improved overall quality of life in older adults with osteoarthritis. Chair yoga is practiced sitting in a chair or standing while holding the chair for support, so it’s a great option for beginners or anyone dealing with an injury or balance problems.
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The treatment of lumbar strain consists of resting the back (to avoid reinjury), medications to relieve pain and muscle spasm, local heat applications, massage, and eventual (after the acute episode resolves) reconditioning exercises to strengthen the low back and abdominal muscles. Initial treatment at home might include heat application, acetaminophen (Tylenol) or ibuprofen (Advil, Motrin), and avoiding reinjury and heavy lifting. Prescription medications that are sometimes used for acute low back pain include anti-inflammatory medications, such as sulindac (Clinoril), naproxen (Naprosyn), and ketorolac (Toradol) by injection or by mouth, muscle relaxants, such as carisoprodol (Soma), cyclobenzaprine (Flexeril), methocarbamol (Robaxin), and metaxalone (Skelaxin), as well as analgesics, such as tramadol (Ultram).
In the elderly, atherosclerosis can cause weakening of the wall of the large arterial blood vessel (aorta) in the abdomen. This weakening can lead to a bulging (aneurysm) of the aorta wall. While most aneurysms cause no symptoms, some cause a pulsating low back pain. Aneurysms of certain size, especially when enlarging over time, can require surgical repair with a grafting procedure to repair the abnormal portion of the artery.
