Some patients do not experience muscular weakness until late teens or early adulthood. Brain is often involved, with seizures, deafness, loss of balance and vision, and retardation common. Progression and severity vary. Varied weakness of shoulder, hip, face and neck muscles. Often a secondary metabolic condition.
Progression varies and carnitine supplementation can be effective.
Severity varies and vigorous exercise should be avoided. Severity varies and intense exercise should be avoided. Severity of disorder varies and intense exercise should be avoided. Patients are often unable to attain previous performance levels, yet condition is nondebilitating and nonprogressive. Severity depends on success in treating underlying thyroid condition.