Demi Lovato suffers from a number of problems. She has a substance abuse problem, for one. She has gone to rehab but did relapse. Hopefully now though she is staying clean from drugs and alcohol. She also has an eating disorder. This stems back to undue pressure being placed on her appearance, especially her body.
This pressure gave way to an eating disorder which is hopefully under control now. She also has some mental disorders. If she is active in therapy, those too may be under control. Her family has some issues and she grew up way too fast is what she confessed to the public in the past. It is sad that she has so many problems because she is a great actress but, she must first take care of herself if she is to do anything further with her career. We are wishing her the best and rooting for her comeback and for her well being too.