This document discusses two medical suffixes: -paresis and -phasia. -Paresis refers to weakness, and can describe conditions like hemiparesis (weakness on one side of the body) and monoparesis (weakness in a single limb). These are often caused by strokes, traumatic brain injuries, or infections. -Phasia refers to speech, and the related terms aphasia and dysphasia describe difficulties with communication due to damage to brain areas involved in language and speech processing, usually from conditions like strokes, infections, or degenerative diseases.