What is the correct prefix for excessive or high?

The prefix that indicates excessive or high levels is "hyper." This term is commonly used in medical terminology to describe conditions characterized by an increase in various physiological parameters. For example, "hypertension" refers to high blood pressure, and "hyperglycemia" indicates elevated blood sugar levels. The use of "hyper" helps to convey that there is a greater than normal presence or level of the condition being discussed, making it a critical term in medical contexts.

In contrast, the prefix "hypo" signifies a deficiency or low level, while "tachy" refers to a fast rate, particularly in relation to heart rate or rhythm, and "brady" indicates a slow rate. Understanding these prefixes is essential for effective communication in healthcare and accurately describing patient conditions.