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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.
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.
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.