<prompt> Paradoxical breathing is seen inPneumoniaPneumothoraxAtelectasisFlial chest  <response>: Two of the symptoms of flail chest are chest pain and shoness of breath. It occurs when multiple adjacent ribs are broken in multiple places, separating a segment, so a pa of the chest wall moves independently. This so-called paradoxical breathing is painful and increases the work involved in breathing Ref Davidson 23rd edition pg 579 