In the course of the evolution of the immune system has evolved a number of mechanisms for the elimination of noxious agents of the body, both those originating from the outside, such as environmental factors, toxins, as well as from the inside, associated with changes in tissue structure. In both cases, the immune response may be too intense and take the wrong form. A situation in which the immune system responding „too” in response to the threat is called hypersensitivity. This term is mainly used in relation to antigens derived from the outside, in case of excessive response to internal antigens (autoantigens) is the term used autoimmunity (autoimmune response). An allergy is known to be hypersensitive immune system. This condition is particularly detrimental to children because during the growth of the immune system is still developing. If left untreated, leads to allergic asthma. For this reason, it is essential to eliminating allergies at the source. The safest due to the lack of appearance of side effects are natural methods. One of them is halotherapy. A visit to the salt cave can significantly relieve the suffering of allergy. Dry salt aerosol by inhalation show 82% effective against allergy. It can be prepared only by artificial means using a device halogenerator. Halotherapy application is a safe method that can be used by people of all ages. It is recommended that the use of Halotherapy in motion, since then we have increased ventilation of the lungs and fine aerosol particles can reach the remotest parts of the respiratory system.