You should see an internist for: 
Physical exams
School sports exam
PAP smear or gynecology exam
Work exam
Preventative exam to determine medical risk factors
Geriatric exam
Acute illness and/or injury
Vaccinations
Recurring health problems
Referrals and/or second opinions
Internal Medicine Physicians
Internal medicine is the branch and specialty of medicine concerning the diagnosis and nonsurgical treatment of diseases in adults, especially of internal organs. Doctors of internal medicine, also called "internists", are required to have included in their medical schooling and postgraduate training at least three years dedicated to learning how to prevent, diagnose, and treat diseases that affect adults. While the name "internal medicine" may lead one to believe that internists only treat "internal" problems, though this is not the case. Doctors of internal medicine treat the whole person, not just internal organs.