Etiology

 Blood loss (Blood donation, Internal bleeding, such as a perforated stomach ulcer, Blood loss from trauma, such as a road accident or deep cut)

)

• Dehydration, which reduces blood volume

 

and certain medications, such as antihypertensive drugs.

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• 
  Emotional stress, fear, insecurity or pain (the most common causes of fainting)
• Pregnancy
• Medications for high blood pressure
• Diuretics, which produce fluid loss
• Medications for depression
• Medications for certain heart conditions
• Allergic reaction to certain drugs or chemicals
• Some forms of infection, such as toxic shock syndrome
• Heart disease, which can hamper the pumping action of the heart muscle
• Some nervous system disorders, such as Parkinson’s disease
• Addison’s disease (where the adrenal glands fail to produce sufficient blood-pressure-maintaining hormones).

 

 

 

 

Hypotension

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