• Low blood pressure (hypotension)
  • Prostate cancer
  • Arrhythmia (heart rhythm disorder)
  • Liver or kidney disease
  • Asthma or other lung disease
  • Blood vessel disease (e.g. atherosclerosis, coronary artery disease)
  • Hyperthyroidism (overactive thyroid gland)
  • Pheochromocytoma (a rare tumor)
  • Heart failure
  • Central nervous system diseases
  • Depression