Paresis

Lore & Background

The term paresis originates from the Ancient Greek πάρεσις 'letting go', from παρίημι 'to let go, to let fall'. Neurologists use paresis to describe weakness, while plegia refers to paralysis with complete loss of voluntary movement. Types of limb paresis include monoparesis (one leg or arm), paraparesis (both legs), hemiparesis (one side of the body), triparesis (three limbs), double hemiparesis (all four limbs with one side more affected), tetraparesis (all four limbs), and quadriparesis (all four limbs equally affected). These terms are frequently used in the context of multiple sclerosis and cerebral palsy.

Reader's Guide

Paresis is a foundational concept in neurology, distinguishing partial weakness from complete paralysis. Its classification into specific types—such as hemiparesis, paraparesis, and tetraparesis—allows precise description of motor impairment in conditions like multiple sclerosis and cerebral palsy. Beyond limbs, paresis applies to other body systems: gastroparesis (impaired stomach emptying), ophthalmoparesis (eye muscle weakness), and vocal cord paresis. Historically, 'general paresis' referred to a symptom of untreated syphilis, but improved treatments have made this usage rare. The term's Greek etymology underscores its long-standing medical use. Understanding paresis is essential for diagnosing and managing neurological disorders, as it helps clinicians assess the extent of motor dysfunction and guide treatment.

Did You Know?

• Neurologists use paresis for weakness and plegia for complete paralysis.
• Types of limb paresis include monoparesis, paraparesis, hemiparesis, triparesis, double hemiparesis, tetraparesis, and quadriparesis.
• In the past, 'general paresis' was a symptom of untreated syphilis.