Lyme borreliosis remains an important and common vector-borne illness in the United States, Europe, and Asia. In the majority of cases, it presents as a localized rash that seldom causes further complications with antibiotic treatment. If left undetected however, various neurologic, cardiovascular, and musculoskeletal manifestations may occur. Reported here is the case of a basic military trainee who first presented with cardiac manifestations of
Lyme disease, highlighting this tick-borne illness as a rare, easily forgotten, and treatable cause of complete heart block.