Tight hip flexors can result in lower back pain, hip pain and injury.  A lot of strain is put on those muscles during activities that involve sprinting and kicking.  For example, runners are more prone to hip flexor injuries because of the small, repetitive movement during running.   But even if you’re not an athlete, hip flexor injuries can occur during everyday activities (for instance, slipping and falling or running to catch a bus).  When those tight muscles are suddenly stretched beyond what they are accustomed to, you might also experience pain in the upper groin region, typically where the hip meets the pelvis.   
When your body comes under stress it can stimulate a reaction from your central nervous system, flooding your body with inflammatory chemicals – definitely not what you want if inflammation is the root of your suffering. Instead try to focus on what you can do and make sure you set aside time to rest. Don’t make the mistake of pushing yourself too hard or trying to do too much at once!

You'll need a resistance band for this one. With this exercise you're focusing on four movements—flexion, extension, abduction and adduction. Try and stand up straight while doing the exercise. If you have to lean excessively, step closer to the anchor point of your band to decrease resistance. You'll find that not only are you working the muscles of the leg that's moving, the muscles of your stance leg will work quite hard stabilizing and balancing.  

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.
Analgesic medications are those specifically designed to relieve pain. They include OTC acetaminophen and aspirin, as well as prescription opioids such as codeine, oxycodone, hydrocodone, and morphine. Opioids should be used only for a short period of time and under a physician’s supervision. People can develop a tolerance to opioids and require increasingly higher dosages to achieve the same effect. Opioids can also be addictive. Their side effects can include drowsiness, constipation, decreased reaction time, and impaired judgment. Some specialists are concerned that chronic use of opioids is detrimental to people with back pain because they can aggravate depression, leading to a worsening of the pain.
_{Pain in the hip can result from a number of factors. Sometimes diseases that affect other joints in the body, such as the inflammation resulting from arthritis, can be the cause of pain in the hip. Depending upon the cause of hip pain, the pain may occur when walking, running, or engaging in activity. Trochanteric bursitis is the most common type of hip bursitis and causes pain at the point of the hip.}
It is not clear whether men or women have higher rates of low back pain.[7][8] A 2012 review reported a rate of 9.6% among males and 8.7% among females.[8] Another 2012 review found a higher rate in females than males, which the reviewers felt was possibly due to greater rates of pains due to osteoporosis, menstruation, and pregnancy among women, or possibly because women were more willing to report pain than men.[7] An estimated 70% of women experience back pain during pregnancy with the rate being higher the further along in pregnancy.[97] Current smokers – and especially those who are adolescents – are more likely to have low back pain than former smokers, and former smokers are more likely to have low back pain than those who have never smoked.[98]
The multifidus muscles run up and down along the back of the spine, and are important for keeping the spine straight and stable during many common movements such as sitting, walking and lifting.[12] A problem with these muscles is often found in someone with chronic low back pain, because the back pain causes the person to use the back muscles improperly in trying to avoid the pain.[31] The problem with the multifidus muscles continues even after the pain goes away, and is probably an important reason why the pain comes back.[31] Teaching people with chronic low back pain how to use these muscles is recommended as part of a recovery program.[31]
Place a mini band around your ankles and spread your feet about shoulder-width apart. Keeping your legs relatively straight (you want the motion to come from your hips) and toes pointing forward, walk forward 10 steps, then backward 10 steps. Take a short break and then walk to the right 10 steps, then to the left 10 steps. Again, focus on keeping your legs straight and toes pointing forward.
Tight hip flexors can also make it harder for your glutes to activate—since they're opposing muscle groups, when one is really tight the other becomes lengthened. When a muscle is more lengthened than it should be, it takes away some of its ability to contract. When your glutes are in this compromised position, it can cause other muscles to do more work than they should, making your workouts less efficient and sometimes, increasing your risk of injury.
Strength training is another key part of the “do” category, Dr. Vasileff says. “It’s a good idea to focus on quad, hamstring, and glute strength,” he says. These muscles surround your hips and provide support, along with your core—which is another area to focus on. “Strengthening your core helps to normalize your walking pattern and stabilize how your pelvis and hips move,” Dr. Vasileff says. That translates to less pain and better hip mobility.
Start kneeling on your mat with knees hip-width apart and hips directly over knees. Press your shins and the tops of your feet into the mat. Bring your hands to your low back, fingers pointing down, and rest palms above glutes. Inhale and lift your chest, and then slowly start to lean your torso back. From here, bring your right hand to rest on your right heel and then your left hand to your left heel. (If you can't reach your heels, turn your toes under; it will be easier to reach your heels in this modification.) Press your thighs forward so they are perpendicular to the floor. Keep your head in a relatively neutral position or, if it doesn't strain your neck, drop it back. Hold for 30 seconds. To come out of the pose, bring your hands to your hips and slowly, leading with your chest, lift your torso as you press the thighs down toward the floor.
Prior to doing this, warm up to avoid overstretching a cold muscle. Great ways to warm up include jumping jacks, skipping, side-stepping, running in place, or any dynamic movements that mimic whatever sport you do. Given that this targets the lower half of your body, it's best to choose movements that will make the muscles in the groin and inner thigh areas warm and pliable.

The side of the pain on its own doesn’t tell us much, and most of the one-sided sources of pain are viscera that usually cause abdominal pain instead of back pain, or in addition to it. In other words, the only reason to worry about right or left lower back pain is if it is otherwise worrisome: if you have other red flags or significant non-back symptoms.

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.
Bridge: Still lying on your back with your feet flat on floor, lift your hips and torso off the floor into a bridge. Then interlace your hands underneath your hips and press your shoulders and upper arms into the floor, lifting your hips higher. Hold for 10 seconds. Lower yourself slowly back down, rolling down from the top of your spine to your tailbone. Repeat three times.
_{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.}

Vertebroplasty and kyphoplasty are minimally invasive treatments to repair compression fractures of the vertebrae caused by osteoporosis. Vertebroplasty uses three-dimensional imaging to assist in guiding a fine needle through the skin into the vertebral body, the largest part of the vertebrae. A glue-like bone cement is then injected into the vertebral body space, which quickly hardens to stabilize and strengthen the bone and provide pain relief. In kyphoplasty, prior to injecting the bone cement, a special balloon is inserted and gently inflated to restore height to the vertebral structure and reduce spinal deformity.