What type of healthcare professional is primarily responsible for managing internal medicine cases?

The primary responsibility for managing internal medicine cases lies with an internal medicine doctor, also known as an internist. Internists are trained to handle a wide range of adult health issues, focusing on the prevention, diagnosis, and treatment of diseases that affect internal organs such as the heart, lungs, kidneys, and digestive system.

Their extensive training equips them with the skills needed to manage complex medical conditions and provide comprehensive care, often coordinating with other specialists as required. This allows them to not only treat illnesses but also to address multiple health concerns simultaneously, which is common in internal medicine.

In contrast, other healthcare professionals in the provided options have specific areas of focus. A registered dietician specializes in nutrition and dietary planning, and while they play an important role in patient healthcare, their expertise does not encompass the comprehensive medical management that an internist provides. An obstetrician is focused on pregnancy, childbirth, and women's reproductive health, which is distinct from internal medicine. Lastly, a nutrition coach primarily offers guidance on nutrition and lifestyle changes, lacking the clinical training to manage internal medicine cases.