Hip Pain or Leg cramps?

It's been months already when my wife has a pain problem in her lower part of the body.  It is hard for her to sit longer than an hour.  We have been so puzzled what is the reason of her leg cramps and hip pain.  The hip pain gives her a hard time standing up because of the pain.   We have to get a massage therapist to reduce the pain she has been experiencing, because of this she is having some problem to move around.  After a good massage the usually disappear for two to three days.  Then the pain will start to return again.  I've been thinking that improper blood circulation is the reason for cramps.  The pain cause to lie down than sitting.  We have been planning to walk around to strengthen her back.