There are many causes of hip joint pain. Some hip pain is temporary, while other hip pain can be long-standing or chronic. Causes of hip pain include arthritis, inflammatory and noninflammatory arthritis, fracture, sprain, infectious arthritis (septic arthritis), avascular necrosis, Gaucher's disease, sciatica, muscle strain, iliotibial band syndrome (IT band syndrome), and hematoma.
Kidneys — The kidneys are a matched pair. One painful kidney can cause back pain on one side or the other. Kidney pain can feel like back pain, and may occur on only one side. It is usually quite lateral, and just barely low enough to qualify as “low” back pain. However, when kidney stones descend through the ureters, they can cause (terrible) pain in the low back. Kidney stone pain is often so severe and develops so rapidly that it isn’t mistaken for a back pain problem.
Bony encroachment: Any condition that results in movement or growth of the vertebrae of the lumbar spine can limit the space (encroachment) for the adjacent spinal cord and nerves. Causes of bony encroachment of the spinal nerves include foraminal narrowing (narrowing of the portal through which the spinal nerve passes from the spinal column, out of the spinal canal to the body, commonly as a result of arthritis), spondylolisthesis (slippage of one vertebra relative to another), and spinal stenosis (compression of the nerve roots or spinal cord by bony spurs or other soft tissues in the spinal canal). Spinal-nerve compression in these conditions can lead to sciatica pain that radiates down the lower extremities. Spinal stenosis can cause lower-extremity pains that worsen with walking and are relieved by resting (mimicking the pains of poor circulation). Treatment of these afflictions varies, depending on their severity, and ranges from rest and exercises to epidural cortisone injections and surgical decompression by removing the bone that is compressing the nervous tissue.
For example, one workout you may want to do lateral lunges with mini-band ankle walks. Another workout you may choose rotational step-ups with the 4-way cable hip exercise. The activation, mobility, and flexibility exercises can be done more frequently and not necessarily as part of a stand-alone workout. There's no one-right way to incorporate these exercises, so don't be afraid to experiment.
When a muscle contracts, it shortens. Take the biceps for example. Without getting too technical, the biceps are attached at the forearm and shoulder. When your biceps contract, they shorten and bring those two points closer together. When you rest, the muscle returns to its normal length, and the two points move farther away. Constantly contracting your biceps over a long period of time would cause them to get shorter, even at rest.

The hip flexors play an important role in everyday mobility and exercise. Involved in pulling the knee toward the hip, most movements either directly or indirectly use the hip flexors. That’s why even the slightest injury can cause great discomfort. Learn how you can recover from a hip flexor injury, and what precautions can be taken to avoid them.
First and foremost, stop slouching. One of the most common causes of low back pain is poor sitting posture. The strain on the back while sitting in a slouched position can cause excessive pressure on the joints, muscles, and discs, causing pain. Learn to sit with correct posture and maintain that posture at all times to help decrease or eliminate your low back pain. Also be sure your workspace is set up properly at home and at work.
Complaints of low back pain are one of the most common reasons people visit doctors.[9][42] For pain that has lasted only a few weeks, the pain is likely to subside on its own.[43] Thus, if a person's medical history and physical examination do not suggest a specific disease as the cause, medical societies advise against imaging tests such as X-rays, CT scans, and MRIs.[42] Individuals may want such tests but, unless red flags are present,[10][44] they are unnecessary health care.[9][43] Routine imaging increases costs, is associated with higher rates of surgery with no overall benefit,[45][46] and the radiation used may be harmful to one's health.[45] Fewer than 1% of imaging tests identify the cause of the problem.[9] Imaging may also detect harmless abnormalities, encouraging people to request further unnecessary testing or to worry.[9] Even so, MRI scans of the lumbar region increased by more than 300% among United States Medicare beneficiaries from 1994 to 2006.[11]
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]