Systemic disorders and metabolic conditions that are associated with headache. The patient will exhibit symptoms related to the underlying condition in addition to the headache.
Disorders of homeostasis related to headache:
• hypoxia/hypercapnia
• High altitude
• Diving
• Sleep apnea
• Dialysis
• arterial hypertension
• pheochromocytoma
• hypertensive crisis with or without hypertensive encephalopathy
• hypothyroidism (often a cause of chronic daily headache)
• Fasting
• preeclampsia
• Cardiac cephalalgia