Headache attributed to disorder of homeostasis

Headache attributed to hypoxia and/or hypercapnia

 * 1) High-altitude headache
 * 2) Diving headache
 * 3) Sleep apnoea headache

Headache attributed to arterial hypertension

 * 1) Headache attributed to phaeochromocytoma [(benign) or (malignant)]
 * 2) Headache attributed to hypertensive crisis without hypertensive encephalopathy
 * 3) Headache attributed to hypertensive encephalopathy
 * 4) Headache attributed to pre-eclampsia
 * 5) Headache attributed to eclampsia
 * 6) Headache attributed to acute pressor response to an exogenous agent