Giardiasis is one of the most common diseases in the world. A very urgent problem of giardiasis for Uzbekistan [1]. The clinical manifestations of giardiasis are diverse, but lesions of the gastrointestinal tract prevail, which is associated with the localization of parasites in the duodenum and jejunum. Along with severe clinical manifestations of giardiasis, latent forms are also described. Isolation of lamblia without clinical manifestations is often used as an argument for evaluating this condition as a healthy carrier of protozoa. We observed 62 patients with a clinically pronounced form of giardiasis at the age from 3 to 15 years. Compared with the subclinical form, the patients of this group had more intense abdominal pain, manifestations of "gastric" and "intestinal" dyspepsia. In addition, some patients had relatively low body weight and growth retardation, which was evidence in favor of malabsorption of nutrients. The maximum localization of pain on palpation of the abdomen was of interest. We studied patients with latent, subclinical and clinical forms of giardiasis. Children with a latent form of the disease did not show any complaints. In subclinical and clinical forms of giardiasis, abdominal pain, intestinal and gastric dyspepsia were observed. With giardiasis, children are prescribed dietary and drug therapy.