Intracranial pressure was recorded continuously during an average of 15 days in 17 patients suffering from primary intracerebral hemorrhage. In 12 cases the highest pressures were recorded just after the stroke; then the intracranial pressure decreased and became normal in an average of 20-30 days. Other patterns of evolution were less often observed: a rapid and lethal elevation of pressure in one case, a constantly low pressure in two, and a stagnant evolution with moderate hypertension in two others. Secondarily developing intracranial hypertension was never observed during the monitoring period. Evacuation of the clots was performed in six patients. This only slightly shortened the course of the increased intracranial pressure. It is concluded that intracerebral hematoma appears as an expanding lesion only during the time of its formation. The prognosis depends more upon the destructions by the hemorrhage than upon the increased pressure. Nevertheless, true hypertension is possible. Knowledge of intracranial pressure in the course of intracerebral hemorrhage is important in deciding whether the treatment is to be surgical or conservative. Measurements of the intracranial pressure in our practice has reduced the number of interventions, with identical or slightly improved results.