Horner's syndrome
More common causes
Migraine
Skull base surgery
Lyme disease
Cervical spondylosis
Less common causes
Goiter
Sympathectomy
Cervical lymphadenopathy
Multiple sclerosis
Neurofibromatosis type 1
Temporal arteritis
Head and neck cancer
Epidural anesthesia
Pancoast tumor
Syringomyelia
Acute ischemic stroke
Thoracic aortic aneurysm
Cervical intervertebral disc herniation
Brain arteriovenous malformation
Cervical spine injury
Neuroblastoma
Chiari malformation
Thyroid tumor
Herpes zoster
Cavernous sinus thrombosis
Carotid artery dissection
Thoracic aortic dissection
Cluster headache
Wallenberg syndrome
Mesothelioma
Granulomatosis with polyangiitis
Mediastinal tumor
Cervical rib
Rhabdomyosarcoma
Neck trauma
Uncommon causes
Klumpke paralysis
Dental abscess
Brain tumors
Subclavian artery aneurysm
Spinal cord tumors
Carotid artery aneurysm
Neck surgery
Central venous catheter placement
Chest tube placement
Assisted vaginal delivery
Thoracic surgery
Brainstem stroke