The laws and regulations regarding doctor-patient confidentiality and medical privacy can vary depending on the country and jurisdiction. However, in general, doctors are expected to respect patient confidentiality and not share your medical information with others without your permission.
In most cases, if you are seeing a new doctor, they will not contact your previous doctor without your explicit consent. Before any information exchange occurs, your new doctor will typically ask you to sign a release form or provide written consent to obtain your medical records from your previous healthcare provider.
There are exceptions to this rule, such as in cases where there is an immediate medical emergency and obtaining consent is not possible, or when there are legal requirements to share certain information, like reporting certain infectious diseases to public health authorities.
It's essential to familiarize yourself with the privacy policies and laws that apply in your specific location to understand your rights and the obligations of healthcare providers regarding the sharing of your medical information. If you have concerns about the handling of your medical records, you can discuss them with your doctor or consult with a legal professional for guidance.