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If a loved one is on steroids like dexamethasone for a brain tumour, side effects can be tough to watch. Here is what to expect, and simple ways to manage each one at home.
When a loved one has a brain tumour, steroids such as dexamethasone are often started to control the swelling around the tumour and ease pressure symptoms. They can work quickly and make a real difference. But because a steroid acts on the whole body, not just the brain, it can also cause a range of side effects that are difficult for both patient and caregiver.
The most important thing to hold on to is this: most steroid side effects are dose-related and reversible. They tend to build up the longer and higher the dose, and they usually settle as the dose is tapered down. This is exactly why your CION team aims for the lowest dose that controls symptoms, for the shortest time needed — following NCCN and EANO guidance.
This page is a practical, day-to-day guide to coping with those effects at home. For how steroids reduce swelling in the first place, and why the dose must be tapered rather than stopped suddenly, see our companion guide on steroids and managing brain swelling (oedema). This page is part of CION's wider guide to brain tumours and their care.
Steroid side effects are closely tied to the dose and how long the medicine is taken — which is why guidelines advise the lowest effective dose for the shortest necessary time. In brain-tumour care, doctors regularly review whether the dose can be reduced, precisely to limit effects like raised blood sugar, muscle weakness and mood changes. (Source: NCCN Guidelines for Central Nervous System Cancers; EANO guideline on the diagnosis and treatment of diffuse gliomas.)
You don't need to manage side effects perfectly. A few simple habits — plus staying in touch with the team — cover most of what caregivers worry about.
Steroids are stimulating, so an evening dose can wreck sleep. With the team's agreement, take the daily dose (or the last dose) in the morning. This one change is the biggest single help for steroid insomnia.
Take steroids with food, and make sure the stomach-protecting medicine (usually a proton-pump inhibitor) the team prescribes is given as directed. Avoid extra anti-inflammatory painkillers unless the doctor approves them.
Appetite often surges. There's no need for a strict diet during illness, but limiting very salty and sugary foods helps with fluid retention and blood sugar. Small, regular, balanced meals work better than large ones.
Keep a simple note of the dose, sleep, mood and any new symptoms. Sharing this with the team means the dose can be adjusted early — before a side effect becomes a bigger problem.
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If side effects are hard to manage, or you're unsure whether the dose can come down, our neuro-oncology team can review the plan and guide your next step.
Here are the effects caregivers most often ask about, with what causes each and simple, practical ways to manage it at home. CION follows NCCN and EANO guidance to use the lowest dose that controls symptoms, for the shortest time needed — which is the best long-term protection against all of these. Tap each one to open it.
A larger appetite, weight gain, and a rounder, fuller face are among the most common — and most visible — steroid effects, and they can be distressing for the whole family. They are driven by appetite, changes in how fat is stored, and fluid retention. The reassuring news is that they are almost always reversible as the dose tapers off. There's no need for a restrictive diet during a serious illness, but gentle, balanced meals, smaller portions eaten more often, and limiting very salty or sugary foods help with fluid retention and blood sugar. Keep snacks healthy and within reach. Reassure your loved one that these appearance changes are the medicine, not the tumour, and that they settle once the steroid is reduced.
Steroids are stimulating and very commonly disturb sleep, which quickly exhausts both patient and caregiver. The simplest and most effective fix is timing: with the team's agreement, give the daily dose (or the last dose of the day) earlier — ideally in the morning — so the stimulating effect has worn off by bedtime. Support this with a calm evening routine, less screen time before bed, and a dark, quiet room. Never move, split, or skip a dose on your own; always confirm any timing change with the team first. If insomnia continues despite an earlier dose, tell the team — a small, supervised adjustment often makes a real difference.
Steroids raise blood sugar, and this can happen even in people who were not diabetic before. In someone with diabetes, existing medication may need adjusting. Watch for excessive thirst, frequent urination, blurred vision, or unusual tiredness, and report these. The team monitors blood glucose while a patient is on steroids and may involve a physician to add or change medication. If your loved one is diabetic, do home glucose checks as advised. Blood sugar usually improves as the dose is tapered. Very high readings combined with drowsiness or confusion need same-day medical review.
Steroids can cause mood swings, irritability, anxiety, restlessness or, in some people, low mood — and occasionally more marked changes in thinking or behaviour. These can be upsetting and are easily mistaken for the tumour itself. It helps to remember it is often the medicine talking. Keep a calm, predictable routine, try not to take irritability personally, avoid arguing over things caused by the steroid, and offer plenty of reassurance. Note any significant change and tell the team, as the dose may need review. Most mood effects ease as the dose comes down. If there is severe agitation, distressing confusion, or any thoughts of self-harm, seek urgent medical advice — do not wait.
Longer steroid courses can weaken the large muscles, especially in the thighs and upper arms — making it harder to climb stairs, rise from a chair, or lift the arms overhead. This is called steroid myopathy, and it is a key reason not to stay on steroids longer than needed. Gentle daily activity and physiotherapy help maintain strength in the meantime, and CION's rehabilitation support can advise safe, tailored exercises. To keep your loved one safe, remove trip hazards, add grab rails where useful, and help with stairs. Strength usually recovers gradually once the dose is lowered. Tell the team if new leg or arm weakness appears while on steroids.
Corticosteroids can irritate the stomach lining and, especially if combined with anti-inflammatory painkillers, raise the risk of a stomach ulcer or bleeding. For this reason a stomach-protecting medicine (such as a proton-pump inhibitor) is usually prescribed alongside steroids — make sure it is taken as directed. Give steroids with food where advised, and avoid extra anti-inflammatory painkillers unless the doctor approves them. Report any indigestion that does not settle. Seek urgent help for severe stomach pain, vomiting blood, or black, tarry stools — these can signal bleeding and need same-day attention.
Steroids dampen the immune system, so infections can take hold more easily — and their usual warning signs, such as fever, can be masked. Wounds may also heal more slowly. Practise good hand hygiene at home, keep any vaccinations discussed with the team up to date, and limit contact with people who are unwell. Report any fever, new cough, burning on urination, or other signs of infection promptly rather than waiting to see if they settle. This effect is another reason the team aims for the lowest effective dose and the shortest necessary course.
Steroids can make the body hold on to fluid, leading to puffiness or swollen ankles, and over longer courses they can thin the skin and cause easy bruising. Limiting very salty foods helps with fluid retention. Handle the skin gently, keep it moisturised, and protect against knocks and pressure sores — especially if your loved one is less mobile. Change position regularly if they spend long periods sitting or lying down. Like most steroid effects, these improve after the taper. Report significant leg swelling or new breathlessness, as fluid retention occasionally needs medical attention.
Struggling with any of these? Ask CION's neuro-oncology team to review the dose and side effects — often the plan can be adjusted to make life more comfortable.
When side effects are hard, it is tempting to reduce or stop the steroid to give your loved one relief. This is one thing you must never do on your own. After more than a couple of weeks, the body's own adrenal glands slow their natural steroid production. Stopping abruptly can trigger a dangerous withdrawal reaction — severe tiredness, nausea, low blood pressure — and a rebound of brain swelling with returning symptoms.
The right way to relieve side effects is to ask the team to review the plan. Where it is safe, they will taper the dose down gradually, following a written schedule, aiming for the lowest dose the symptoms allow. As the dose falls, most side effects ease with it. We explain tapering in full — and why it matters so much — on our steroids and brain swelling page.
If a taper schedule has not been clearly explained, or the current dose feels too high to live with, ask CION to review it — balancing relief and safety is exactly what the team is there for.
Managing steroids well is part of good supportive cancer care — not an afterthought. CION delivers the following directly for you and your loved one:
Every case is reviewed by a multidisciplinary brain tumour treatment team before any plan is finalised — because comfort and the right treatment go hand in hand.
Most steroid effects are manageable, but some need same-day attention. Seek urgent care — or A&E — for any of these:
When in doubt, it is always safer to be checked early. Call 18002028726 or use emergency services.
Many steroid side effects — including muscle weakness, thinning skin and raised infection risk — become more likely the longer steroids are taken, which is why the treating team keeps reviewing whether the dose can be reduced or the steroid stopped. Reducing the dose is often the single most effective way to relieve side effects. (Source: NCCN Guidelines for Central Nervous System Cancers; EANO guideline on the diagnosis and treatment of diffuse gliomas.)
Get a free written second opinion from CION's neuro-oncology team — especially useful if side effects are difficult, or you're unsure whether the steroid dose can be reduced.
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Start Your Story. Book Free Consultation.The effects caregivers notice most are increased appetite and weight gain (including a rounder face), trouble sleeping, mood and behaviour changes, and raised blood sugar. Over longer courses, muscle weakness in the thighs and upper arms (steroid myopathy), thinning skin, easy bruising, stomach irritation and higher infection risk can appear. Most of these are dose-related and settle as the steroid is tapered down. Not everyone gets every effect, and severity varies with dose and duration. Your CION team follows NCCN and EANO guidance to use the lowest dose that controls symptoms, which keeps side effects to a minimum. Report anything new so the plan can be adjusted early.
Steroids such as dexamethasone increase appetite, change how the body stores fat, and cause fluid retention. Together these lead to weight gain and a fuller, rounder face (sometimes called a "moon face"). It can be distressing to watch, but it is a well-recognised, reversible effect — the changes fade once the dose is tapered off. There is no need for a strict diet during a serious illness, but gentle, balanced meals and limiting very salty or sugary foods can ease fluid retention and blood sugar swings. Reassure your loved one that this is the medicine, not the tumour, and that their appearance will settle in the weeks after the steroid is reduced. See our companion guide on steroids and brain swelling for how the dose is decided.
Steroids are stimulating, so disturbed sleep is very common — and exhausting for both patient and caregiver. The single most effective fix is timing: with medical agreement, take the daily dose (or the last dose of the day) earlier, ideally in the morning, so the stimulating effect wears off by bedtime. A calm evening routine, reduced screen time, and a dark, quiet room also help. Never move a dose, split it, or skip it on your own — always confirm any timing change with the CION team first, because the dose schedule is set for a reason. If insomnia persists despite an earlier dose, tell the team; a small, supervised adjustment often makes a real difference.
Yes. Steroids commonly raise blood sugar (steroid-induced hyperglycaemia), and this can happen even in people who were not diabetic before. In someone with diabetes, existing medication may need adjusting. Watch for excessive thirst, frequent urination, blurred vision or unusual tiredness, and report these. Your team monitors blood glucose while a patient is on steroids and can involve a physician to add or change medication. Blood sugar usually improves as the dose is tapered. If your loved one is diabetic, home glucose checks — as advised by the team — help catch problems early. Very high readings, drowsiness or confusion need same-day medical review.
Steroids can cause mood swings, irritability, anxiety, restlessness, or in some people low mood — and occasionally more marked changes in thinking or behaviour. This can be upsetting and is easily mistaken for the tumour itself. It helps to remember it is often the medicine talking. Keep a calm, predictable routine, avoid arguments over things caused by the steroid, and give reassurance. Note any significant changes and tell the team, as the dose may need review. Most mood effects ease as the steroid is reduced. If there is severe agitation, distressing confusion, or any thoughts of self-harm, seek urgent medical advice — do not wait.
Longer steroid courses can weaken the large muscles, especially in the thighs and upper arms — making it harder to climb stairs, rise from a chair, or lift the arms overhead. This is called steroid myopathy. It is a major reason not to stay on steroids longer than needed. The good news is that strength usually recovers gradually once the dose is lowered. Gentle daily activity and physiotherapy help maintain muscle in the meantime, and CION's rehabilitation support can advise safe exercises tailored to your loved one. Tell the team if new leg or arm weakness appears while on steroids, so the dose and plan can be reviewed.
Most steroid effects are manageable, but some need same-day attention. Seek urgent help if there is black, tarry or bloody stools or vomiting blood (a sign of stomach bleeding), severe stomach pain, a fever or clear signs of infection (steroids can mask these), very high blood sugar with drowsiness or confusion, or severe agitation or thoughts of self-harm. Separately, remember that rising pressure in the head is an emergency: increasing drowsiness, repeated vomiting, a sudden severe headache, new confusion, a first-ever or worsening seizure, or sudden one-sided weakness all need same-day care. When in doubt, call CION on 18002028726 or use A&E — it is always safer to be checked early.
For most people, steroid side effects improve and reverse as the dose is reduced — appetite settles, the face and weight return toward normal, mood steadies, sleep improves, and muscle strength recovers. That is exactly why the team aims to bring the dose down to the lowest level the symptoms allow, and off completely where possible. Crucially, steroids must be tapered gradually, never stopped suddenly, to avoid a withdrawal reaction and a rebound of brain swelling — we explain this fully on our steroids and brain swelling page. If side effects are hard to live with, do not adjust the dose yourself; ask the CION team to review the plan so relief and safety are balanced together.
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