Hi I'm having sever lower back and hip pain for no reason what could be causeing it what can I do to reduce the pain?

Why no reason? Just because you didn't have an injury doesn't mean there is not reason for the pain. To decrease the pain, i would try ice along with NSAID medication and rest including avoidance of any exacerbating activity if you have no cause for the problem, you may need to work on strength and flexibiltiy to the affected area. Also, check out the condition of your mattress.
Myofascial Pain. The most likely cause for this pain is knots in your butt muscles. These knots can send pain to your lower back and also down your leg. You can learn more about how your muscles cause this pain, and what you can do to stop the pain in a book: winners' guide to pain relief on amazon.