Asthma is very common disease of respiratory system. It is the leading cause of morbidity and mortality throughout the world. It is estimated that over 20% of world population suffers from allergic diseases such as allergic asthma, conjunctivitis, rhinitis, atopic dermatitis and anaphylaxis. Allergic asthma is the most common type asthma in children and adults. It is chronic disease with reversible bronchial obstruction. The obstruction is caused by inflammation, edema and smooth muscles contractions in airways. Allergens inhaled in airways cause hypersensitive reaction, many inflammation cells are produced and all that leads to characteristic changes. The most common allergens that cause attacks are pollen, dust, animal hair, some plants. The symptoms of asthma attack are dyspnea, cough, high tone wheezing during expiration followed with chest squeezing, or with combination of those symptoms. Status asthmaticus it is a term for progressive, long lasting attack that does not respond to usual therapy. Hospitalization is necessary because it can lead to death. Diagnostics, classification and control of asthma are defined by Global Initiative for Asthma (GINA). Allergic asthma is diagnosed by history, clinical examination, blood and allergy tests and spirometry (gold standard). The treatment includes avoiding of allergens and pharmacotherapy (bronchodilatators, corticosteroids). Asthma can be controlled with regular education and drug use, breathing and relaxation exercises and avoidance of causative factors.