Thare are many causes of fainting
, but in the setting of acute pain, fainting is suaually neurally mediated, in what we call a vasovagal reaction, an automatic nerve
is stimulated due to the pain and causes the heart rate
to go low as well as the blood pressure.
Plenty of fluids, avoiding pain and sitting down when you get premonitory symptoms are all indicated.
Dr Brenes-Salazar MD
Mayo Clinic MN