No, ataxia is not always hereditary. Ataxia is a neurological symptom that affects coordination, balance, walking, speech and sometimes eye movements. It occurs when parts of the nervous system responsible for coordinating movement, particularly the cerebellum and its connections, are damaged or do not function properly. Ataxia can develop at any age and may have genetic or non-genetic causes.

Acquired ataxia develops because of external factors, medical conditions or nutritional deficiencies. Common causes include stroke, brain tumours, head injuries, excessive alcohol consumption, vitamin B12 or vitamin E deficiency, infections, autoimmune disorders and certain medications. Some causes are reversible or treatable. For example, ataxia associated with vitamin E deficiency may improve with appropriate supplementation, particularly when treatment begins early.

Hereditary ataxia results from genetic variants that affect the development or function of the nervous system. These variants may be inherited from one or both parents, depending on the inheritance pattern. Some genetic conditions can also arise from a new variant that was not previously present in the family. Therefore, a person may have hereditary ataxia even when no other family member is known to have the condition.

Common hereditary ataxias include spinocerebellar ataxias (SCAs), Friedreich ataxia and ataxia with vitamin E deficiency. Different genetic variants can produce similar symptoms, making clinical assessment and genetic testing important for diagnosis.

The evaluation usually begins with a neurological examination, medical and family history, and appropriate investigations, such as brain MRI and blood tests. If a hereditary cause is suspected, genetic testing may be recommended. Depending on the suspected condition, testing may involve repeat-expansion analysis, targeted gene testing or broader genetic sequencing. Standard sequencing alone may not detect every repeat expansion.

Identifying the cause is important because treatment, prognosis and reproductive risks differ between conditions. Some acquired causes can be treated directly, while hereditary conditions may require long-term symptom management, surveillance and genetic counselling.