BackgroundLyme disease is a tick born infectious disease caused by different genospecies of Borrelia bacteria (B. burgdorferi sensu strictu (ss), B. afzelii and B. garinii). The signs and symptoms of Lyme disease vary, they usually appear in stages, but the stages can overlap. In early stage skin rash (erythema migrans) appears, which may be accompanied by fever, chills, fatigue, body aches, headache, neck stiffness, and swollen lymph nodes. Later signs and symptoms can be these: joint pain and inflammation, neurological problems or other less common syndromes - heart problems, eye inflammation, and liver inflammation. Lyme disease is very common disease in the world, approximately 300,000 people get Lyme disease each year in the United States (Centers for disease control and prevention US), in Lithuania disease frequency is 101.6 cases per 100 000 population (Center for Communicable Diseases and AIDS, Lithuania, 2016 year).ObjectivesTo investigate the frequency of rheumatic symptoms between Lyme diagnosed persons in Lithuania, based on epidemiological data.MethodsWe have analyzed data of Center for Communicable Diseases and Aids of Lithuania about Lyme diagnosed patients from 2014 to 2016 years.ResultsTotal number of cases was 7425. 2791 males, 4633 females, age range 1 - 91 years, median age 52 years. 996 patients found out as symptomatic. The rest were either asymptomatic either information about clinical disease manifestation was not known. Among symptomatic patients two rheumatic symptoms were observed: arthralgia (220 cases, 22,1%), 140 females, 80 males, age range 12 – 84 years, median age 58 years, and myalgia (78 cases, 7,8%), 44 females, 34 males, age range 15-80, median age 56. Other symptoms were erythema migrans (75.6%), headache (15.2%), general weakness (12.4%), fever (10, 1%), and head dizziness (6.4%).ConclusionIn total, almost 30 percentages (29, 91%) of symptoms were rheumatic. To conclude, joint pain and/or muscle pain can lead not only to systemic rheumatic diseases, but to infection diseases as well (for example: Lyme disease).References[1] Sergamumo užkrečiamomis ligomis Lietuvoje apžvalga 2016. Užkrečiamų ligų ir AIDS centras. 96-98 pages. http://www.ulac.lt/uploads/downloads/leidiniai/Sergamumo_apzvalga_2016.pdf[2] Franc Strle, Gary P. Wormser, Linden T. Hu, John A. Branda, Joppe W. R. Hovius, Xin Li, and Paul S. Mead. Lyme borreliosis. Nat Rev Dis Primers. 2017 Aug 3;3:17062. doi: 10.1038/nrdp.2017.62.[3] Lyme disease: summary of NICE guidance. BMJ2018;361:k1261.[4] Clinical spectrum of Lyme disease. Cardenas-de la Garza, J.A., De la Cruz-Valadez, E., Ocampo-Candiani, J. et al. Eur J Clin Microbiol Infect Dis (2018). https://doi.org/10.1007/s10096-018-3417-1Disclosure of InterestsNone declared