Increased intracranial pressure (ICP): Because of its position and intracranial length, increased ICP from any cause can lead to injury and dysfunction
Vascular: Aneurysm, central venous sinus thrombosis
Inflammatory: Post-viral, demyelinating, sarcoidosis, giant cell arteritis, Miller-Fisher Syndrome variant of Guillian-Barre Syndrome
Neoplastic: Lesions in the cerebellopontine angle. In children – pontine glioma
Degenerative/deficiency: Vitamin B deficiency, Wernicke-Korsakoff syndrome
Iatrogenic: Post-lumbar puncture, status-post surgery involving head
Infection: Meningitis, lyme disease, syphilis
Congenital: Rare to find true congenital<unk> 
Autoimmune: Myasthenia Gravis
Trauma: Especially if a torsional head motion or medial wall orbital fracture (with entrapment of the medial rectus muscle
Endocrine: Diabetic cranial mononeuropathy - the incidence of palsy in the 3rd, 6th, and 7th cranial nerves is significantly higher in patients with diabetes
Sixth nerve palsy
Increased intracranial pressure 
Third nerve palsy
Vascular: Aneurysm, central venous sinus thrombosis
Fourth nerve palsy
Inflammatory: Post-viral, demyelinating, sarcoidosis, giant cell arteritis, Miller-Fisher Syndrome variant of Guillian-Barre Syndrome
Ulnar neuropathy
Neoplastic: Lesions in the cerebellopontine angle. In children – pontine glioma