An internal medicine doctor, also known as an internist, is trained to diagnose and treat a wide range of medical conditions that affect adults. These doctors are primary care physicians who specialize in managing complex and chronic illnesses, as well as providing preventative care. Some of the most common conditions diagnosed by internal medicine professionals include: • Diabetes and prediabetes. • Heart disease, such as hypertension or a history of cardiac events. • Gastrointestinal conditions. • Respiratory conditions, such as chronic obstructive pulmonary disease (COPD) and asthma. • Thyroid disorders. • Infectious diseases. • Neurological disorders, such as chronic migraines and epilepsy. • Kidney problems. • Autoimmune disorders. • Acute conditions, such as urinary tract infections (UTIs), dehydration, and heat stroke. Internists thoroughly review medical histories, perform physical examinations, and run diagnostic tests to determine the underlying cause of your symptoms and develop well-suited treatment plans. Internal medicine professionals can also provide preventative care, vaccinations, and routine health screenings.