• Other causes of secondary hypertension, eg, primary hyperaldosteronism, Cushing’s syndrome, renal artery stenosis
• Panic attacks
• Thyrotoxicosis
• Acute intermittent porphyria
• Carcinoid syndrome
• Paroxysmal tachycardia
• Preeclampsia-eclampsia

Associated conditions

• MEN 2a and 2b
• Neurofibromatosis (Recklinghausen's disease)
• von Hippel-Lindau disease

• Spells (nonspecific)
• Hypertension
• Anxiety