- Aphasia
- Apraxia
- Arachnoid Cysts
- Arachnoiditis
- Arnold-Chiari Malformation
- Arteriovenous Malformations
- Aspartame
- Asperger's Disorder
- Assistive Mobile Devices
- Ataxia
- Ataxia-telangiectasia
- Atomoxetine
- Attention Deficit Hyperactivity Disorder
- Autism
- Autonomic Dysfunction
- Back Pain
- Bassen-Kornzweig Syndrome
- Batten Disease
- Behçet Disease
- Bell's Palsy
- Benign Positional Vertigo
- Benzodiazepines
- Beriberi
- Binswanger Disease
- Biopsy
- Blepharospasm
- Bodywork Therapies
- Botulinum Toxin
- Botulism
- Brachial Plexus Injuries
