The caudate nucleus is important in the modulation of motor functions and may influence cognitive and mental functions. However, cases of cognitive and behavioral disorders caused by caudate stroke are rare in practice. We report a case of 26 year-old female patient who presented with abrupt onset of cognitive and behavioural dysfunctions in post partum period on 4th day of elective caesarean section. Her prominent symptoms include fever, abnormal behaviour in form screaming, not identifying family members and not feeding baby. Computed tomography revealed no significant abnormality and magnetic resonance imaging of the brain revealed an acute infarction in the head of the left caudate nucleus in post portum period.