DefinitionBasal ganglia dysfunction is a problem with the basal ganglia, the deep brain structures that help start and control movement.Causes, incidence, and risk factorsConditions that cause injury to the brain can damage the basal ganglia. Such conditions include:Drug overdoseHead injuryInfectionLiver diseaseMetabolic problemsMultiple sclerosisSide effects of certain medicationsStrokeTumorsMany brain disorders are associated with basal ganglia dysfunction. They include:DystoniaHuntington's diseaseMultiple system atrophyParkinson's diseaseProgressive supranuclear palsyWilson's diseaseThis list may not be all-inclusive.SymptomsDamage to the basal ganglia cells may cause problems with one's ability to control speech, movement, and posture. A person with basal ganglia dysfunction may diffic