I was wondering what doctor do i go to for the following check ups.. cancer, diabetes, depression, heart problems and any other problems?

Primary Care: You should see a primary care doctor. This would be a doctor specialized in internal medicine or family practice. They will talk with you, do a complete physical examination, and order necessary laboratory tests to check for the issues you are concerned about.

Primary care doctor: The single best doctor to see for a variety of problems is your regular primary care provider. This physician will refer you to specialists as needed. That's what they do!