What does the suffix "-pathy" refer to?

The suffix "-pathy" is derived from the Greek word "pathos," which means suffering or disease. In medical terminology, it specifically refers to a disease condition or disorder affecting a particular part of the body or a specific function. For example, "neuropathy" indicates a disease condition affecting the nerves.

The other options pertain to different medical meanings. The suffix that refers to protein would likely be "-protein," indicating substances related to proteins. Mass swelling typically involves terms like "-edema," which is used to describe an accumulation of fluid. Lastly, blood conditions often use the suffix "-emia," which denotes a condition of the blood, such as "anemia" or "leukemia." Since "-pathy" denotes a disease condition, it is the correct answer in this context.