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The number one cause of lower-back pain is a tight hip flexor (or psoas). It happens to everyone and is usually caused by sitting down; another cause is sleeping on your side in a fetal position.

The number one cause of lower-back pain is a tight hip flexor (or psoas). It happens to everyone and is usually caused by sitting down; another cause is sleeping on your side in a fetal position. back pain dolor de espalda