Alopecia As if MS weren’t unfair enough, the immune system sometimes launches accidental attacks on your hair follicles. Hair loss due to alopecia isn’t permanent, but it could take months to grow back. Other Terms Antibody The secret to defending against bacteria and viruses. Ataxia Unsteady on your feet? Learn more about ataxia. Autoimmune Disease When the immune system gets a bit confused... Axon The middle men of the nervous system, often impacted by MS. View More