This study was undertaken to investigate the effects of theileriosis on the cardiovascular system in cattle. Blood samples were collected from 50 cattle naturally infected with Theileria spp. (before and after treatment) as well as from 30 non-infected cattle. Hematological parameters and the serum concentrations of total cardiac troponin I (cTnI), aspartate aminotransferase (AST), creatine kinase (CK), and creatine kinase MB (CK-MB) were measured. Also coagulation parameters, plasma levels of activated partial thrombo plastin time (APTT), prothrombin time (PT) and D-dimer were measured. The presence of anemia and the levels of cTnI, CK-MB, CK and AST indicated statistically significant differences between infected and healthy cattle, but no statistically significant differences between the two groups were found in DD levels at the end of the study. Reduction in anemia and reduced levels of cTnI, CK-MB, CK, AST, APTT and PT were also found in post-treatment analyses. The results indicate that anemia, coagulation disorders and hypoxia in theileriosis in cattle can induce myocardial tissue damage.