Paget's disease of the bone is a condition of unknown cause in which the bone formation is out of synchrony with normal bone remodeling. This condition results in abnormally weakened bone and deformity and can cause localized bone pain, though it often causes no symptoms. Paget's disease is more common in people over the age of 50. Heredity (genetic background) and certain unusual virus infections have been suggested as causes. Thickening of involved bony areas of the lumbar spine can cause the radiating lower extremity pain of sciatica. 

These exercises can be done three to five times per week; be sure to build in a rest day here or there to allow your hip muscles to recover. Working to strengthen your knees and ankles can be done as well to be sure you completely work all muscles groups of your lower extremities. Remember, your ankle and knee muscles help control the position of your hips, just as your hip muscles control the position of your knees and ankles. They all work together in a kinetic chain.
_{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.}
^ Jump up to: a b c d e f g Hughes SP, Freemont AJ, Hukins DW, McGregor AH, Roberts S (October 2012). "The pathogenesis of degeneration of the intervertebral disc and emerging therapies in the management of back pain" (PDF). J Bone Joint Surg Br. 94 (10): 1298–304. doi:10.1302/0301-620X.94B10.28986. PMID 23015552. Archived from the original (PDF) on 4 October 2013. Retrieved 25 June 2013.
Lumbar herniated disc. The jelly-like center of a lumbar disc can break through the tough outer layer and irritate a nearby nerve root. The herniated portion of the disc is full of proteins that cause inflammation when they reach a nerve root, and inflammation as well as nerve compression cause nerve root pain. The disc wall is also richly supplied by nerve fibers, and a tear through the wall can cause severe pain.
^{In addition to these exercises, there are simple things you can do every day to help reduce your risk of hip flexor pain.  If you sit at a desk for long periods of time, try to get up and move around every hour or so.  Warm up properly before any physical activity, and stretch regularly at the end of each workout.  Your hips will thank you for it!} 
_{Treatment options include physical therapy, back exercises, weight reduction, steroid injections (epidural steroids), nonsteroidal anti-inflammatory medications, rehabilitation and limited activity. All of these treatment options are aimed at relieving the inflammation in the back and irritation of nerve roots. Physicians usually recommend four to six weeks of conservative therapy before considering surgery.}
Along with these exercises, it's also important to do some supplementary exercises to work your hip's supporting muscles. You've probably heard of your shoulder's rotator cuff. Well, your hip also has a cuff, or a group of muscles that help stabilize and support movement. For these exercises, you'll need a mini-band, a longer thera-band or tubing (both are sold at many sporting goods stores, or can be purchased online), and a cable-column unit.
There is controversy and scientific uncertainty about trigger points. It’s undeniable that mammals suffer from sensitive spots in our soft tissues … but their nature remains unclear, and the “tiny cramp” theory could be wrong. The tiny cramp theory is formally known as the “expanded integrated hypothesis,” and it has been prominently criticized by Quintner et al (and not many others). However, it’s the mostly widely accepted explanation for now. BACK TO TEXT
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^{Low back pain (LBP) is a common disorder involving the muscles, nerves, and bones of the back.[4] Pain can vary from a dull constant ache to a sudden sharp feeling.[4] Low back pain may be classified by duration as acute (pain lasting less than 6 weeks), sub-chronic (6 to 12 weeks), or chronic (more than 12 weeks).[3] The condition may be further classified by the underlying cause as either mechanical, non-mechanical, or referred pain.[5] The symptoms of low back pain usually improve within a few weeks from the time they start, with 40–90% of people completely better by six weeks.[2]}