Ataxia is a movement disorder characterized by a lack of order, impacting balance, movement, and speech, affecting over 10,000 adults and 5,000 children in the UK. Common types include Friedreich's ataxia, sensory ataxia, vestibular ataxia, and cerebral ataxia, with causes ranging from vitamin B12 deficiency to genetic defects and toxic exposures. While there is no cure, treatments like medications, speech therapy, and physical therapy can help manage symptoms.