What causes Low Blood Pressure?

By  , Expert Content
Feb 24, 2011

The cause of low blood pressure is often not clear. Some causes of low blood pressure include;

  • Pregnancy
  • Certain medications, such as medications for high blood pressure, certain heart medications, certain medications for Parkinson's disease, tricyclic antidepressants, or medications to treat erectile dysfunction
  • Heart diseases like slow heart beat, disturbance of heart rhythm, diseases of heart valve, heart attack, or heart failure
  • Hormonal or endocrine problems such as hypothyroidism, overactive thyroid (hyperthyroidism), Addison's disease, low blood sugar, or diabetes
  • Heat exhaustion or heat stroke


What Causes a Sudden Drop in Blood Pressure?

A sudden drop in your blood pressure can become an emergency. Some causes of sudden drop in blood pressure include:

  • Excess loss of blood
  • Alteration in body temperature (low body temperature or high body temperature)
  • Disease of heart muscle (myocarditis) causing heart failure
  • Sepsis, or serious infection of the blood stream
  • Severe dehydration or loss of water from body due to vomiting, diarrhea, or fever
  • Anaphylactic reaction (it is a life-threatening allergic reaction)


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