Cerebrovascular diseases
Stroke
Cerebral hemorrhage
Berry aneurysm
Subarachnoid hemorrhage
Subdural hematoma
Temporal arteritis
Carotid artery dissection
Vertebral artery dissection
Hydrocephalus
Space-occupying mass
Post-traumatic headache
Reduced brain oxygen
Hypoxia
Anoxia
Carbon monoxide poisoning
Infection
- Fever
- Sinusitis
- Middle ear infection (otitis media)
- Meningitis
- Cerebral abscess
- Influenza
Thyroid problems
- Hypothyroidism
- Hyperthyroidism
Diabetes
Obesity
Hypoglycemia
Hypertension
Hypotension (primary or due to medications)
Anemia
- Iron deficiency anemia
- Folic acid deficiency anemia
- Vitamin B12 deficiency anemia
- Polycythemia
- Magnesium deficiency
Vitamin D deficiency
Depression
Post-traumatic Stress Disorder (PTSD)
Allergies
Temporomandibular joint (jaw joint) disorders (TMJ)
Teeth grinding (bruxism)
Wisdom teeth/other dental problems
Refractive errors
Acute glaucoma
Rheumatic diseases
Uremia
Dialysis treatment
Secondary to medicine
- Excessive use of painkillers
- Starting/stopping use of antihistamines
- Starting/stopping use of SSRI
- Starting/stopping use of antihypertensives
- Starting/stopping use of pseudoephedrine
- Starting/stopping use of opiates
- Starting/stopping use of corticosteroids
Caffeine addiction