Tight hip flexors occur for a variety of reasons. Those who run frequently or engage in other activities that put strain on the hip flexors are likely to experience hip flexor tightness at one time or another. A blow to the hip or poor conditioning can also be causes of tight hip flexors. These causes can usually be attributed to tiny tears that occur to our hip flexors through rigorous activity.
The only activity performed on a regular basis that fully extends the hip is walking and running. Hence as activity levels decrease so does the ability to extend the hip. This results in compensatory pelvic tilting and lumbar extension, with a reduction in the ability to accommodate uneven ground, negotiate obstacles, or attempt to change walking speed quickly. The compensatory pelvic tilt that accompanies tight hip flexors also predisposes the individual to postural problems and back pain. Hip stretches done on a regular basis can help you maintain extension range of motion and thereby improve function.
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.