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In medicine, laryngospasm is an uncontrolled/involuntary muscular contraction (spasm) of the vocal folds. The condition typically lasts less than 60 seconds, but in some cases can last 20-30 minutes and causes a partial blocking of breathing in, while breathing out remains easier.
Heartburn/GORD health centre. Laryngospasm: Causes, symptoms and treatments. Laryngospasm happens when the muscles of the vocal cords seize up, restricting the flow of air into the lungs. This may happen during the night, with a person waking up unable to speak or breathe. This condition is relatively rare.