Does glioblastoma cause a first-time seizure?

Glioblastoma can irritate or disrupt nearby brain tissue, creating abnormal electrical activity that may trigger a seizure. A seizure may involve shaking, stiffening, staring, unresponsiveness, unusual sensations, or brief confusion; it does not always look like dramatic convulsions. The pattern depends on which brain area is affected.

A first seizure does not establish the cause. Sleep loss, low blood sugar, medication effects, infection, stroke, head injury, and other neurological conditions can also be involved. Clinicians usually combine the event description with an examination and tests such as brain imaging and an electrical recording of brain activity.

Arrange urgent medical assessment after any first-time seizure, even if the person appears fully recovered. Record what happened before, during, and after the event, including awareness, movements, duration, injury, fever, recent illness, sleep, medicines, and substance exposure. Do not restrain the person or place anything in their mouth. During a seizure, move nearby hazards away, cushion the head, and turn the person on their side when possible.

Until assessed, avoid driving, swimming alone, bathing in deep water, heights, and operating machinery. A clinician can explain local safety requirements and whether treatment is needed while the cause is investigated.

Call emergency services if the seizure continues beyond the time advised by a clinician, repeats without recovery, causes serious injury, happens in water, or the person has trouble breathing or does not wake normally. Seek immediate help for a first seizure with pregnancy, diabetes, high fever, or a suspected serious head injury. New weakness, speech difficulty, severe confusion, or a sudden severe headache also requires emergency assessment.

Ask what tests are needed to look for a structural brain cause, whether an anti-seizure medicine is appropriate, what warning symptoms need emergency attention, and which activities should be paused. If glioblastoma is diagnosed, ask how the tumour location may affect seizure risk and how seizure care fits with the wider treatment plan.