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.
The irritation of the sciatic nerve causes hip and lower back pain, which spreads downwards to the limbs and feet. It is estimated that 4 out of 10 people will develop sciatica or irritation of this nerve at some point in life. The sciatic nerve is located deep in the buttock, beneath the piriformis muscle, so its constriction and swelling can also cause sciatica pain and irritations.
Symptoms of the neuropathies above would include burning sensation in leg areas where these nerves are housed as well as lack of coordination of these leg muscles. Other symptoms include muscle wasting, pain, and twitching, cramps, and spasms in these nerves. Treatment focuses on isolating the underlying cause of the nerve disorder and addressing it using medications such as injected glucocorticoids and/or physical

Take a step back and think about where you spend most of your day. If you're a young athlete, you probably spend most of your time at school or maybe work or practice and  even a little time at home, if you're lucky. Now think about what position your body is in during those periods. I would bet that you spend most of your day sitting down. You may walk to class or run in practice, but the majority of your day is spent in a seated position.
Approximately 15 degrees of hip extension is required to walk normally. If hip flexors are tight then in order to walk, compensatory movement needs to take place through the lower back causing back pain and premature disc degeneration. Like other joints, if we fail to take them through their full range on a regular basis we eventually lose mobility.
During pregnancy a woman’s abdominals get stretched out. There is no way to avoid this with a growing baby. Muscles work most effectively when they are at an optimal length. Not too short and not too long. The lengthening that happens during pregnancy puts the abdominal muscles at a decreased advantage for working. This decreases the amount of support they provide for spinal stability.  
How to: Start feet hip-width apart, with your arms straight out in front of you. Step one foot back on a diagonal, feet flat. Once your foot reaches the floor, lower into a shallow lunge. Keep your knee bent and butt back, twist your pelvis, and rotate your arms back behind your body until they frame the knee. Return to starting position. That's one rep. Do eight reps on each side. Do three to four sets before moving on to the next move, resting for 30 seconds in between each set.
With lumbar stenosis nerves in the spinal cord and lower back become compressed. This type of injury can cause many of the symptoms of sciatica—including numbness and tingling in the legs and pain in the buttocks. Possible treatments include a sciatic nerve block, steroid injections, opioid pain medications, physical therapy, and rest. However, the use of epidural steroid injections is not supported by limited amount of available evidence.
You're more likely to get a hip flexor injury if you've had one in the past, you don't warm up properly before engaging in athletic activity, your muscles are already tight or stiff, or your muscles are weak from being overused. If, while exercising, you try to do too much at once in too short an amount of time, you can also put yourself at risk for a hip flexor injury.
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