DIFFERENTIAL DIAGNOSIS OF SECONDARY HEADACHES
Subarachnoid hemorrhage
Pseudotumor cerebri
Temporal arteritis (Giant cell arteritis)
Meningitis
Cerebral/ cerebellar lesions
Brain tumors
Brain abscess
Cerebral edema
Increased intracranial pressure
Arteriovenous malformations/ aneurysms
Cerebral vascular accident
Ischemic
Hemorrhagic
Neurocystercircosis
Coccidioidomycosis Mengingitis
Arnold-Chiari malformation
Partial seizures
Temperomandibular joint disorder
Cervical strain
Varicella-zoster (Shingles)
Sleep apnea
Eagle’s syndrome (results from an elongated styloid process or calcified stylohyoid ligament)
Glossopharyngeal neuralgia
Superior laryngeal neuralgia
Gradenigo’s syndrome (retro-orbital pain, suppurative otitis, abducens palsy, and diplopia)
Posttraumatic neuralgia
Tolosa-Hunt syndrome (retro-orbital pain and ophthalmoplegia)
Trigeminal neuralgia
Chronic carbon monoxide exposure
SEVERE HEADACHE WITH SUDDEN ONSET
Subarachnoid hemorrhage
Meningitis
Encephalitis
Ischemic stroke
Increased intracranial pressure with tonsilar herniation
Cerebral venous sinus thrombosis
Carotid or vertebral artery dissection
Intraparenchymal or subdural hemorrhage
Hypertensive crisis
Temporal arteritis
Acute angle-closure glaucoma
Optic neuritis