How long does radiotherapy take to work for glioblastoma?

Glioblastoma is a tumour in the brain. Radiotherapy is often planned with other treatments and is directed at the area identified by scans and surgery or biopsy findings. Radiation changes tumour cells over time, while nearby brain tissue can also become inflamed. This can make early scan findings difficult to interpret.

Your team may compare MRI scans with your symptoms, neurological examination, and medicines. Headache, weakness, speech changes, seizures, or tiredness can reflect the tumour, treatment, swelling, or another cause. A symptom becoming better or worse does not independently prove the treatment response.

Take steroids, anti-seizure medicines, or other prescriptions exactly as directed, and do not stop them suddenly unless your clinician tells you to. Keep a record of headaches, seizures, strength, balance, speech, vision, and alertness. Plan rest and ask about driving, work, and activities that require concentration or balance.

Attend scheduled scans and reviews even when symptoms are stable. Tell the team about new medicines, supplements, or changes in your ability to manage everyday tasks.

Seek urgent medical help for a first seizure, a seizure lasting longer than your team advised, sudden weakness on one side, new trouble speaking, severe or rapidly worsening headache, repeated vomiting, increasing drowsiness, or loss of consciousness. Contact your oncology team promptly for any new or steadily worsening neurological symptom.

Ask when your next MRI will be reviewed, how swelling will be monitored, and which symptoms should trigger an urgent call. Ask how to take steroid or seizure medicines, whether your usual activities are safe, and who can help if memory, speech, or mobility changes.