As per Cancer Research UK, seizures happen in up to 8 out of every 10 people (up to 80%) with a brain tumour.
"You might have some jerking or twitching of your hands, arms or legs. Or your seizure might affect your whole body," the health body explains.
According to the US National Brain Tumor Society, seizures are a sudden attack or convulsion caused by abnormal bursts of electricity in the brain.
Signs include: muscle contractions, staring, loss of consciousness, as per the health body.