Certain symptoms and medical conditions are not just related to one organ system of the body. Dizziness or lightheadedness, blackouts or syncope, fatigue, heart racing or palpitations or even chest pains, for example,  may have origin in different organ systems. Often a search for the cause is necessary across multiple body systems and also the way different organs and systems interact with each other. 

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Some diseases and medical conditions are complex and have effects and complications in multiple body systems. Diabetes, obesity, metabolic syndrome and Postural Orthostatic Tachycardia Syndrome (POTS) are some examples. 

Identifying what systems are involved and managing health as a whole person is necessary. 

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Preventative measures can make a large difference if the risks are identified early and managed, for example, with high blood pressure (hypertension) or a family history of stroke or coronary artery disease. 

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Medications often need review with regard to benefit, potential side effects and interactions. 

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These are some of the speciality areas of a General Physician.