The invention relates to the use of a guanylate cyclase C activated peptide for the treatment of respiratory airway problems and problems associated with ventilation disorder and/or mucous secretion disorders via the airways, in addition to a medicament which is fed via the airways. The invention also relates to an inhalation device which contains the medicament and a method for diagnosing the illnesses associated with inhalation disorders and mucous secretion disorders in the airways, by detecting a guanylate cyclase C activated peptide. The peptides which are used are guanylin, uroguanylin and lymphoguanylin or a heat resistant enterotoxin.
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