Chronic Headache

Dangerous Mass Lesion / Subdural Hematoma / Hydrocephalus Idiopathic Intracranial Hypertension Temporal Arteritis

Not Dangerous (Usually) Tension Headache Chronic Cluster Headache Chronic Migraine Allergic Rhinitis; Sinusitis Neck Sprain or Strain Medications / Drugs / Toxins Irritating Symptom Elsewhere in Body Depression