Lung cancer and brain tumours: what should you know?

Lung cancer can spread to the brain and form a secondary tumour, so new neurological symptoms need prompt medical assessment. This is different from a tumour that begins in brain tissue. The care team uses scans, examination and details about the lung cancer to plan treatment.

A brain deposit may cause headache, nausea, seizures, weakness, numbness, balance problems, confusion, speech changes or changes in vision. Some people have no symptoms and the finding is made during staging. An MRI scan can show the brain in detail; the team may also review scans of the chest and other parts of the body. Symptoms can come from swelling around a lesion, the lesion itself, or another condition, so a symptom alone does not establish the cause.

Contact the oncology team promptly about a new or worsening neurological symptom. Bring a list of medicines, previous scan reports and details of when each symptom began. Treatment depends on the number, size and position of lesions, the lung cancer type, symptoms and overall health. Options may include medicines to reduce swelling, radiotherapy, stereotactic radiosurgery, surgery or chemotherapy. Your team may combine approaches and monitor response with further imaging.

Seek emergency care for a first seizure, repeated vomiting, sudden weakness or numbness, new trouble speaking, severe confusion, fainting, a sudden severe headache or difficulty walking. Do not drive yourself after a seizure or sudden neurological change. If symptoms are milder but persistent, contact the cancer team the same day for advice.

Ask whether the brain finding is confirmed, what the MRI shows, whether swelling needs treatment, and which option fits the location and number of lesions. You can also ask how treatment may affect concentration, movement or driving, what follow-up scans are planned, and who to contact outside clinic hours.