Stress often triggers dizziness. This is evidenced in many conditions in which it is a common symptom. For example, dizziness and vertigo are both common symptoms of post-traumatic stress disorder. Vestibular migraine, a condition that typically causes sufferers to feel dizzy, is also known to be triggered by stress. One explanation for this is that stress can cause anxiety, which can lead to shallow breathing. The result of this a decrease in the amount of oxygen available in the blood. The lack of oxygen received by the brain can then lead to lightheadedness.
There is evidence that some individuals tend to hyperventilate once they become aware of this symptom. It can worsen to the point where they begin to feel dizzy. It is also important to note that three different types of stress can cause individuals to feel dizzy: mental, physical, and emotional stress. Of these three types, various studies have associated mental and emotional stress more strongly with dizziness.