Paradoxical Vocal Fold Movement (PVFM)
Paradoxical vocal fold movement (PVFM), happens when the vocal folds close instead of open. For example, when taking a deep breath, the vocal folds should open to let air through to the lungs. With PVFM, the vocal folds will close, making it hard to breathe. Often misdiagnosed as asthma, PVFM most often causes wheezing, stridor, and breathing problems.