10 Symptoms of Claustrophobia

3. Hyperventilating

Hyperventilation occurs when a person starts breathing very fast. They may have difficulty catching their breath, and begin breathing out more than they are breathing in. This brings the carbon dioxide level in the body down, leading to other symptoms like lightheadedness and tingling in the fingers. Hyperventilation is most often caused by anxiety, panic, stress, or nervousness, but it can also be brought on by physical stress such as severe bleeding, lung infection, or a heart attack.