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• Orthostatic intolerance

• Pachymeningitis

• Papilledema

• Paraneoplastic syndromes of the nervous system

• Paraparesis

• Paraplegia

• Parasitic brain abscess

• Parasomnia

• Paresthesias

• Parkinsonism

• Parkinson's disease

• Pediatric brain tumors

• Pediatric hydrocephalus

• Periodic limb movement disorder

• Peripheral nerve injuries

• Peripheral nerve tumors

• Peripheral neuropathy

• Peroneal neuropathy

• Pinched spinal nerve

• Pineal tumor

• Pituitary tumors

• POEMS syndrome

• Polymyositis

• Polyneuropathy

• Polyradiculopathy

• Posterior cortical atrophy

• Postherpetic neuralgia

• Post-polio syndrome

• Postural orthostatic tachycardia syndrome

• Postural tachycardia syndrome

• Primary lateral sclerosis (PLS)

• Primary progressive aphasia

• Prion disorders

• Progressive bulbar palsy

• Progressive multifocal leukoencephalopathy

• Progressive nonfluent aphasia

• Progressive nonspondylotic myelopathy

• Progressive pseudobulbar palsy

• Progressive supranuclear palsy

• Pseudobulbar palsy

• Pseudotumor cerebri

• Pure autonomic failure

• Quadriparesis

• Radial neuropathy

• Radiculopathy

• Recurrent meningitis

• REM sleep behavior disorder

• Restless legs syndrome

• Rhabdomyolysis

• Ruptured disk

• Sarcoidosis

• Scapuloperoneal muscular dystrophy

• Sciatic neuropathy

• Sciatica

• Seizures

• Semantic dementia

• Sensory neuropathy

• Shortness of breath

• Sjogren's associated encephalopathy

• Sleep disorders

• Slurred speech

• Small fiber neuropathy

• Small vessel white matter disease

• Spasticity

• Speech disturbance

• Spells

• Spina bifida

• Spinal abscess

• Spinal arteriovenous malformation (AVM)

• Spinal cord disease

• Spinal cord injury

• Spinal cord lymphoma

• Spinal cord metastases

• Spinal cord tumor

• Spinal muscular atrophy

• Spinal stenosis

• Spinobulbar atrophy

• Spinocerebellar degeneration

• Spinocerebellar disease

• Spondylolisthesis

• Spondylosis

• Spondylotic myelopathy

• Stiff person syndrome

• Stroke

• Stroke prevention

• Subacute sclerosing panencephalitis

• Subarachnoid hemorrhage

• Subdural hematoma

• Subdural hemorrhage

• Supranuclear palsy

• Syringomyelia

• Takayasu's arteritis

• Tardive dyskinesia

• Tay-Sachs disease

• Temporal arteritis

• Tension headache

• Thalamic pain

• Third nerve palsy

• Thoracic outlet syndrome

• Thoracic radiculopathy

• Tics

• Tingling

• Tolosa-Hunt syndrome

• Torticollis

• Tourette syndrome

• Transient global amnesia

• Transient ischemic attack (TIA)

• Transverse myelitis

• Traumatic brain injury

• Tremor

• Trigeminal neuralgia

• Ulnar neuropathy

• Vascular dementia

• Vascular headache

• Venous angioma

• Venous malformation

• Venous thrombosis

• Vertebral artery blockage

• Vertebral artery dissection

• Vertebral artery stenosis

• Vertebral tumor

• Vertebrobasilar insufficiency

• Vertigo

• Visual loss

• Vocal cord paralysis

• Voice disorders

• Whipple's disease

• Writer's cramp