Headache occurs in 50% to 60% of primary brain 浙医-院 tumors and in35%to50% of metastatic tumors The headache is associated with nausea and vomiting in 40% of patients and may be temporarily relieved by vomiting, as a result of hyperventilation Seizures may be the first symptom of a brain tumor Patients older than 20 years presenting with a new-onset seizure are aggressively investigated for a brain tumorHeadache occurs in 50% to 60% of primary brain tumors and in 35% to 50% of metastatic tumors. The headache is associated with nausea and vomiting in 40% of patients and may be temporarily relieved by vomiting, as a result of hyperventilation. Seizures may be the first symptom of a brain tumor. Patients older than 20 years presenting with a new-onset seizure are aggressively investigated for a brain tumor