Summary. According to WHO data, about 4.5 million people are affected by parasitic diseases. In the last decade, the attention of clinicians has been drawn to parasitic diseases caused by helminth larvae of animals that are not characteristic of humans. Filariasis is the only transmissible human helminthosis in Ukraine. Despite the fact that there is an opinion that helminthiasis has become “forgotten diseases” in modern conditions, there is a tendency to underestimate their medical and social importance all over the world. In confirmation of the above, the article describes the case of treatment of a patient with filariasis. This clinical example demonstrates that this topic is relevant not only for effectionist doctors, but also for doctors of other specialties. Helminthiasis is often the last point in the chain of differential diagnostic thinking of the doctor. The urgency of the problem is due primarily to the significant prevalence, the pronounced negative impact on the human body, the polymorphism of clinical manifestations, which complicates the differential diagnosis of diseases, the lack of sterile immunity and specific methods of prevention.