II. Causes: Acute Secondary Headache
- Infection
- Systemic infection
- Viral Encephalitis
- Meningitis
- Fever with neck stiffness
- Metabolic
- Electrolyte disturbance
- Hypoglycemia
- Hypoxia
- Hypercapnia
- Toxins
- Lead Poisoning
- Carbon Monoxide Poisoning
- Flu-like symptoms in multiple house mates
- Progressively worse each morning
- Chemical Dependency or withdrawal
- Vascular causes
- Subarachnoid Hemorrhage
- Sudden onset, new worst Headache
- Cerebrovascular Accident (CVA or TIA)
- Cerebellar infarction
- Vascular Malformation (not ruptured)
- Temporal Arteritis
- Headache with localized pain, tenderness, and nodularity over temporal region
- Jaw Claudication is pathognomonic
- Arterial Hypertension
- Blood Pressure over 180-200/120
- Cerebral Venous Sinus Thrombosis
- Associated with Hypercoagulable state and head and neck infections
- Venous thrombosis or Thromboembolism
- Cervical Artery Dissection (Carotid Artery Dissection, Vertebral Artery Dissection)
- Similar presentation to Subarachnoid Hemorrhage with facial or Neck Pain
- Associated with Cranial Nerve abnormalities
- Collagen Vascular disease
- Reversible Cerebral Vasoconstriction Syndrome
- Subarachnoid Hemorrhage
- Cerebrospinal fluid pressure
- Spinal Headache or Idiopathic Intracranial Hypotension (low CSF Pressure)
- Pseudotumor Cerebri (high CSF Pressure)
- Overweight, young women
- Miscellaneous causes
- Post-Seizure
- Preeclampsia
- Intracranial Mass
- New, progressively worse Headache in age over 50 or malignancy history
- Worse in mornings and in head down position
- Pituitary Apoplexy
- Pituitary Adenoma with bleeding and localized swelling
- Thunderclap Headache with Vomiting and Visual Field Deficits
- Acute Post-Traumatic Headache
- High risk for Subdural Hematoma in Coagulopathy or Anticoagulation
- Acute Angle-Closure Glaucoma