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One of the current cutting-edge problems in allergy and ENT is the study of comorbidity in allergic rhinitis, which is the most common atopic disease among all other atopies. Two decades ago, a new endotype of the disease, local allergic rhinitis, was discovered. In the past, some patients with typical complaints of chronic nasal congestion, persistent runny nose, and other similar symptoms, did not display such characteristic diagnostic criteria as positive allergy skin tests and an increased value of serum total IgE and specific IgE antibodies. They were qualified by allergists and ENT specialists as individualists with non-allergic rhinitis and, accordingly, did not receive adequate treatment. However, their symptoms remained, prompting them to abuse decongestants and resulting in an increased burden on the cardiovascular system. This, along with the burden of concomitant pathology, including other atopies, can be considered a significant medical and social problem. With the purpose to study rank correlation between comorbidity and three laboratory biomarkers, 46 patients with allergic rhinitis were examined. The list of parameters included two routine items such as serum total IgE and eosinophilic cationic protein, and rarely studied IL-4 in skin exudate. Clinical analysis showed that significantly more often allergic rhinitis in patients was combined with bronchial asthma (in 39.1%, p < 0.05), less often with food allergy (in 19.6%), atopic dermatitis (in 10.9%), insect allergy (in 8.7%), and allergic urticaria (in 4.5%). In one case, local perennial rhinitis was identified, accompanied by conventional seasonal rhinitis with a high content of serum total IgE and positive allergic skin tests with pollen allergens. Skin tests with household allergens, including house dust mite products, showed a negative result. This case was regarded as a manifestation of the so-called “double” allergic rhinitis. The Spearman correlation demonstrated a negative mean strength relationship between comorbidity and serum IgE and eosinophilic cationic protein (p < 0.05). The seemingly paradoxical result can be interpreted quite logically, taking into account immunopathogenetic mechanisms of allergic inflammation. In particular, with an increase in the frequency of atopic comorbidity, the migration of eosinophils from the blood to sites of eosinophilic inflammation increases.