When to worry about a first-time seizure with brain metastases

A seizure is a burst of abnormal electrical activity in the brain. A metastatic tumour, swelling around it, bleeding, treatment effects, infection, or changes in medicines can lower the brain's seizure threshold. A convulsion is not the only form: staring, unresponsiveness, unusual movements, sudden speech trouble, or a brief period of confusion can also be seizure activity. The care team may need to review medicines and arrange brain imaging or other tests.

Move nearby objects away, cushion the head, loosen tight clothing, and turn the person on their side when possible. Do not restrain them, put anything in their mouth, or give food, drink, or tablets until they are fully alert. Time the event and note the movements, breathing, awareness, injury, and recovery. If safe, a witness can record a short video for the medical team.

Call emergency services for a first seizure, a seizure that continues for several minutes, repeated seizures without full recovery, breathing difficulty, a serious injury, pregnancy, or new weakness, severe headache, confusion, or vision loss. Do not drive yourself. Even if the episode stops quickly, contact the oncology or neurology team urgently because the cause and need for anti-seizure treatment must be assessed.

Could the seizure relate to a metastasis, swelling, bleeding, infection, or a medicine change? Do I need imaging or an electroencephalogram? Should I start or adjust an anti-seizure medicine? What should my family do if another episode occurs?