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Cancer in or spreading to the brain can raise the pressure inside the skull. A headache that is worse in the morning or on coughing, being sick without feeling sick, new confusion, a fit or a change in vision needs a same-day call to your cancer team. Usually a brain scan is done and a steroid called dexamethasone is started to reduce the swelling, then lowered as soon as it can be.
Raised intracranial pressure in cancer is usually from brain metastases or a primary brain tumour with surrounding oedema, or a bleed into or around a tumour. The Scottish Palliative Care Guidelines list a headache gradually increasing, classically worse in the morning and on coughing, sneezing or bending, vomiting often without nausea, visual disturbance, dizziness, personality change and seizures; signs (raised blood pressure, altered consciousness, ocular palsies, papilloedema) are often late. Management there: urgent CT brain may be necessary; a trial of corticosteroids with gastroprotection, dexamethasone 8 to 16 mg immediately, then 4 to 8 mg twice daily with the second dose before 2 pm, stopped promptly if there is no benefit and reduced gradually in responders; raise the head of the bed; stop anticoagulants if a bleed is suspected; analgesia and antiemetics (ondansetron); referral to oncology and consideration of neurosurgery.
The Congress of Neurological Surgeons (2019, Level 3) recommends steroids for temporary relief of symptoms from raised pressure, a starting dose of 4 to 8 mg/day of dexamethasone for mild symptoms and 16 mg/day or more for severe symptoms, dexamethasone as the steroid of choice, and tapering as rapidly as tolerated; it finds insufficient evidence for steroids in people without symptoms or mass effect. The trial behind the lower dose (Vecht 1994) found 4 mg/day gave the same improvement at one week as 16 mg/day, with fewer toxic effects, in people without signs of impending herniation. NICE NG122 (lung cancer) offers dexamethasone for symptomatic brain metastases, reduced to the minimum dose that keeps symptoms controlled. EANO-ESMO 2021 could not be read.
Why: Pressure in the skull rises when lying flat overnight and when straining, so the pattern of the headache is a clue.
“Headache often worse on coughing, sneezing and bending over”
NHS Scotland, Scottish Palliative Care Guidelines (Right Decisions platform) 2026
Why: Signs such as swelling at the back of the eye often appear late.
“Diagnosis is usually based on the history. Signs are often late but can include:”
NHS Scotland, Scottish Palliative Care Guidelines (Right Decisions platform) 2026
Why: A scan shows whether there is a tumour, swelling or bleeding, and guides treatment.
“Urgent CT Brain may be necessary.”
NHS Scotland, Scottish Palliative Care Guidelines (Right Decisions platform) 2026
Why: Blood thinners can make bleeding inside the skull worse.
“If intracranial bleed suspected stop anticoagulants”
NHS Scotland, Scottish Palliative Care Guidelines (Right Decisions platform) 2026
Why: Steroids reduce the swelling around the tumour; the earlier afternoon dose helps sleep, and the stomach protection reduces ulcers.
“Consider a trial of corticosteroids with gastroprotection (usually proton pump inhibitor),”
NHS Scotland, Scottish Palliative Care Guidelines (Right Decisions platform) 2026
Why: Lower doses work as well for many people and cause fewer side effects; severe symptoms need more.
“If patients exhibit severe symptoms consistent with increased intracranial pressure, it is recommended that higher doses such as 16 mg/d or more be considered.”
Congress of Neurological Surgeons, Neurosurgery 2019 · Level 3
Why: Long courses of steroids cause diabetes, muscle weakness, mood change and infection.
“Discontinue promptly if no benefit and reduce gradually in responders.”
NHS Scotland, Scottish Palliative Care Guidelines (Right Decisions platform) 2026
Why: Sitting up helps the pressure fall, and controlling symptoms matters while other treatment is planned.
“Raise the head of the patient’s bed”
NHS Scotland, Scottish Palliative Care Guidelines (Right Decisions platform) 2026
Why: Surgery, radiotherapy or drug treatment may treat the cause; the team also needs to know what this means for the future.
“Referral to oncology is important to understand the implications for the patient’s prognosis, and whether disease-modifying therapy would be offered”
NHS Scotland, Scottish Palliative Care Guidelines (Right Decisions platform) 2026
How care is usually carried out, read from the guidelines and standards cited. Your own team's protocol and their judgement come first; this page is for understanding it, not for doing it yourself.
No graded guideline read for this page addresses raised intracranial pressure in cancer as an emergency in its own right. The Congress of Neurological Surgeons 2019 guideline is the graded source for steroids (Level 3, from a systematic review that found only two eligible studies): dexamethasone, 4 to 8 mg/day for mild symptoms and 16 mg/day or more for severe ones, tapered as fast as tolerated, and no recommendation either way when there are no symptoms. The Scottish Palliative Care Guidelines give the practical bedside sequence (CT, dexamethasone with gastroprotection, head up, anticoagulant review, referral). Their starting dose (8 to 16 mg, then 4 to 8 mg twice daily) is higher than the CNS lower range; the randomised evidence (Vecht 1994) supports 4 mg/day for people without signs of impending herniation. NICE NG122 adds that the dose should be reduced to the minimum needed. The EANO-ESMO 2021 guideline, the current European standard for brain metastases, could not be read.
Congress of Neurological Surgeons, Neurosurgery 2019 · NHS Scotland, Scottish Palliative Care Guidelines (Right Decisions platform) 2026 · Neurology 1994 · NICE 2019 · EANO and ESMO, Annals of Oncology 2021
Where it differs: Starts at 4 to 8 mg a day for mild symptoms rather than 8 to 16 mg as a first dose followed by 8 to 16 mg a day.
Evidence: CNS 2019, Level 3; Vecht 1994 double-blind randomised trials in 96 patients: 4 or 8 mg/day gave the same improvement in performance status at one week as 16 mg/day, and toxic effects were more frequent at 16 mg/day.
Congress of Neurological Surgeons, Neurosurgery 2019 · Neurology 1994
Where it differs: Withholds dexamethasone from people whose brain metastases cause no symptoms or mass effect.
Evidence: CNS 2019 found insufficient evidence to recommend for or against; NICE NG122 offers dexamethasone only to people with symptomatic brain metastases.
Congress of Neurological Surgeons, Neurosurgery 2019 · NICE 2019
| Recommendation | Grade, as printed | Source |
|---|---|---|
| Corticosteroids for temporary relief of symptoms from raised intracranial pressure and oedema “Corticosteroids are recommended to provide temporary symptomatic relief of symptoms related to increased intracranial pressure and edema secondary to brain metastases.” | Level 3 | Congress of Neurological Surgeons, Neurosurgery 2019 |
| Dexamethasone as the steroid of choice “If corticosteroids are given, dexamethasone is the best drug choice given the available evidence.” | Level 3 | Congress of Neurological Surgeons, Neurosurgery 2019 |
| Offer dexamethasone for symptomatic brain metastases and reduce to the minimum maintenance dose “Offer dexamethasone to people with symptomatic brain metastases and reduce to the minimum necessary maintenance dose for symptomatic response.” | not graded (NICE; dated 2011) | NICE 2019 |
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