What does the suffix "-penia" indicate in medical terminology?

The suffix "-penia" is used in medical terminology to denote a deficiency or a lack of something, typically referring to cells or substances in the body. For instance, in terms like "leukopenia," it indicates a deficiency of white blood cells. The usage of "-penia" helps healthcare professionals communicate specific conditions involving reduced quantities of cells or elements critical to health. Understanding this suffix is essential for interpreting various medical conditions, as it directly relates to the levels of biological substances or cells that are crucial for normal bodily functions.