OBJECTIVE: We present a case report of a patient with cerebral venous thrombosis during pregnancy. DESIGN: Case report. SETTING: Department of Gynaecology and Obstetrics at the Silesian Hospital. METHODS: Own observation, review of literature. CONCLUSION: In any tonic-clonic convulsions in pregnancy, we mainly think of an eclamptic attack and pregnancy must be ended. In case of persistent problems in the postpartum period after stabilization of the patients, differential etiology of convulsive states such as epileptic seizure, hypoglycemic spasms, CNS tumor, intracranial bleeding, cerebrovascular accident or cocaine overdose must be considered within the differential diagnosis.