How is a disease defined?

A disease is defined as a disordered or incorrectly functioning organ, part, structure, or system of the body. This definition encompasses a wide range of health conditions, including those that affect bodily functions, structures, and overall systems. It emphasizes that disease can involve any component of the body that is not operating as it should, which can lead to symptoms and health issues that significantly impact an individual's quality of life.

This definition is comprehensive, recognizing that diseases may arise not just from infections, but from various causes including genetic anomalies, environmental factors, and lifestyle choices. By capturing the broader concept of dysfunction within the body’s systems, this perspective allows for a more nuanced understanding of health and illness, as it does not restrict disease to just infections or malfunctioning cells or organs. Instead, it acknowledges the interconnectedness of various bodily systems and how disturbances in one area can affect overall health.