Possible health problems in mom. so can i tell the doctor whose following her?

Yes: You can tell your mother's doctor about your concerns, but because of confidentiality the doctor can't tell you about your mother's health information unless she okays this. Do you not believe your mother can or will inform her doctor about her health problems? It may be best to discuss your concerns with your mother first, and see what she'll say. She may call her doctor herself.