1) Prolonged standing or upright sitting, particularly when standing with legs in a locked position for long periods of time
2) Stress
3) Any painful or unpleasant stimuli, such as:
a. Giving a blood donation or watching someone give one
b. Watching someone experience pain
c. Watching/experiencing medical procedures
d. Sight of blood
e. Occasions of slight discomfort, such as dental and eye examinations
4) Hyperthermia, a prolonged exposure to heat
5) Sudden onset of extreme emotions
6) Hunger
7) Nausea or vomiting
8) Dehydration
9) Urination ('micturition syncope') or defecation ('defecation syncope')
10) Abdominal straining or 'bearing down' (as in defecation)
11) Swallowing ('swallowing syncope') or coughing ('cough syncope')
12) Random onsets due to nerve malfunctions
13) Pressing upon certain places on the throat, sinuses, and eyes
14) High altitude
15) Use of certain drugs that affect blood pressure, such as amphetamine
16) Intense laughter
Some of these triggers get me weak.
Swallow Syncope.
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