This case report presents a computational analysis of hemorheology in a patient diagnosed with diabetes who experienced encephalitis subsequent to pneumonitis. Hemorheology pertains to the study of blood flow characteristics and plays a critical role in comprehending and addressing various medical ailments. Employing a computational hemorheology model, the outcomes revealed noteworthy irregularities in hemorheology, which potentially contributed to the development of encephalitis following pneumonitis. Moreover, the pre-existing diabetes condition of the patient likely further complicated the hemorheological changes. These findings indicate that computational modeling of hemorheology offers valuable insights into the underlying mechanisms of diabetes-related complications and may have significant clinical implications for predicting and managing such complications. Consequently, this case report emphasizes the significance of comprehending hemorheological alterations in individuals with diabetes and underscores the potential of computational hemorheology in forecasting and addressing complications associated with this condition. The study observed abnormal hemorheology in the patient, including alterations in red blood cell deformability, aggregation, and viscosity. The findings suggest that computational modeling of hemorheology provides valuable insights into the mechanisms behind encephalitis subsequent to pneumonitis and holds potential clinical applications in predicting and managing complications associated with these conditions.