Friedreich ataxia (MONDO_0100339, a Monarch Disease Ontology id) is an inherited condition that affects the nervous system and causes movement problems. People with this condition develop impaired muscle coordination (ataxia) that worsens over time. Other features include the gradual loss of strength and sensation in the arms and legs, muscle stiffness (spasticity), and impaired speech. Many individuals have a form of heart disease called hypertrophic cardiomyopathy. Some develop diabetes, impaired vision, hearing loss, or an abnormal curvature of the spine (scoliosis). Most people with Friedreich ataxia begin to experience the signs and symptoms around puberty. Also known as: FA, FRDA, Friedreich's Ataxia, Friedreich's ataxia, Friedreich's tabes.