What are the potential symptoms of brain metastases, and when is immediate emergency care required?

2026-09-15

The symptoms of brain metastases depend on the location, size of the lesions, and the extent of cerebral oedema. The most common complaints include headache, focal neurological deficits (such as unilateral limb weakness, paralysis, facial asymmetry, or speech disturbances), new-onset epileptic seizures, as well as changes in mental status, cognitive functions, and behaviour (confusion, memory impairment). Symptoms of increased intracranial pressure also frequently occur, such as headache accompanied by nausea, projectile vomiting, and visual disturbances.

Immediate emergency care is required in the presence of the following alarm symptoms (red flags): - Sudden-onset, stroke-like symptoms (sudden limb weakness, hemiplegia, inability to speak, or vision loss), - New-onset or prolonged epileptic seizures, - Altered mental status, loss of consciousness, rapidly worsening somnolence, or comatose state, - Sudden, extremely severe headache and intractable vomiting, which may indicate cerebral herniation or intratumoural haemorrhage.

In the case of brain metastases, acute deterioration is often caused by intracranial haemorrhage or acute intracranial hypertension resulting from peritumoural oedema, necessitating emergency imaging (CT/MRI), as well as immediate antioedema therapy (for example, osmotic therapy, corticosteroids) or urgent neurosurgical decompression.

References

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  3. Primary Anal Squamous Cell Carcinoma With Metastasis to the Brain Presenting As Stroke-Like Symptoms in a 27-Year-Old Patient. PMID 41994809
  4. Metastatic gestational trophoblastic neoplasia presenting initially as intraparenchymal and subdural hematoma: a case report. PMID 42289757
  5. An all-in-one workflow for emergency hippocampal-avoidance whole-brain radiotherapy in brain metastases, with optional online adaptive extension. PMID 41383179
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