Secondary hypertension is defined as hypertension due to an:

Secondary hypertension is characterized by high blood pressure that results from an identifiable medical condition or specific factors. Conditions such as renal disease, endocrine disorders, and certain medications can lead to secondary hypertension. Recognizing an identifiable cause is crucial, as it can guide targeted treatment options aimed at addressing the underlying issue rather than simply managing the hypertension itself.

In contrast, hypertension that arises without any identifiable medical cause is termed primary or essential hypertension. This form of hypertension is more common and typically associated with genetic, lifestyle, and environmental factors but does not have a clear, singular underlying pathology. Age-related changes and certain environmental factors may contribute to primary hypertension, but they do not specifically define secondary hypertension, which hinges on a clear and recognizable source.