- Sandhoff Disease
- Schilder's Disease
- Schizencephaly
- Schizophrenia
- Sciatic Neuropathy
- Sciatica
- Seizures
- Septo-optic Dysplasia
- Shaken Baby Syndrome
- Shingles
- Single Proton Emission Computed Tomography
- Sixth Nerve Palsy
- Sjogren-Larsson Syndrome
- Sleep Apnea
- Social Workers
- Sodium Oxybate
- Sotos Syndrome
- Spasticity
- Speech Synthesizer
- Spina Bifida
- Spinal Cord Infarction
- Spinal Cord Injury
- Spinal Muscular Atrophy
- Spinocerebellar Ataxia
- Status Epilepticus
- Stiff Person Syndrome
- Striatonigral Degeneration
- Stroke
- Sturge-Weber Syndrome
- Stuttering
