The allergic laryngitis - develops more often at night and is shown by a syndrome of a croup the-anxiety complicated by an inspiration, barking tussis, a cyanosis of labiums and a nose and a labial triangle. The voice is kept. Depending on gravity of a condition of the child distinguish four degrees of development of a laryngitis: 1 degree - respiration is compensated, an attack short; 2 degree (subindemnification) - participates in the certificate of respiration an auxiliary musculation, intimate activity becomes frequent; 3 degree (decompensation) - the expressed dyspnea with a sharp tightening of compliant places of a thorax, a local cyanosis; 4 degree (asphyxia) - the expressed cyanosis, a unconsciousness, a cardiac standstill.