My Daughter Is 29 Years Old And Has Begun Having

My Daughter is 29 years old and has begun having severe discoloration, pain and swelling in her chest, hands, feet. She says that she is in constant pain. A doctor told her that she has to see a secialist because they cannot determine the exact cause of these symptoms. Can you please give me some advice or any additional info as to what may be going on with her body?