Lower back pain due to Pranayama?

People complain of suffering from pain, aches and various other ailments while practicing Yoga. But how many of them follow the laid-down system then? Yoga is a systematic approach of mind control through breath-control leading to state of samadhi – union of individual consciousness with cosmic consciousness. Pranayam is central to it as the same primarily deals with perfection in breath-control however what precedes pranayama can not be ignored.