My sister has been falling down lately and she can t get back up because she doesn t have enough strength to do so. She has had chronic back pain all her life and has had countless rhysotomies on her back for this pain. They have worked. She has polycystic ovarian syndrome as well and she has recently had thyroid cancer and a complete removal. Why is she falling? The nerve doctor told her she already has some muscles in her arms that are dead.