Etiology

Essential HTN in 85-90 %.

Secondary HTN 10-15 %.

Causes:

  • Sleep apnea syndrome.
  • Renal failure.
  • Renovascular HTN.
  • Primary aldosteronism.
  • Pheochromocytoma.
  • Aortic coarctation.
  • Cushing syndrome.
  • Hypo or hyperthyroidism.