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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.
1 Physical obstruction of the airway by a foreign body. 2  Respiratory diseases that involve obstruction of the airway. 3  Compression of the laryngopharynx, larynx or vertebrate trachea in strangulation.  Laryngospasm, a temporary closing of the vocal cords, which simulates the feeling of choking.