Nearly everyone with a glioma encounters steroids — most commonly dexamethasone — at some point. They're not the same as the anabolic steroids athletes misuse; these are corticosteroids that powerfully reduce inflammation. Understanding why they're used and how to use them safely is important.
Why steroids are used A brain tumor is often surrounded by swelling (edema) in the brain tissue. Because the skull is a closed space, that swelling raises pressure and can cause or worsen symptoms — headaches, nausea, weakness, or drowsiness. Dexamethasone reduces this swelling, often improving symptoms quickly, sometimes dramatically within a day or two. Steroids are used around surgery, during radiation if swelling increases, and to manage symptoms at various points.
The catch: side effects Steroids are very effective but can cause significant side effects, especially with higher doses or longer use:
- Increased appetite and weight gain, often with a rounder face and changes in body fat distribution
- Difficulty sleeping, restlessness, or mood changes (including irritability or anxiety)
- Raised blood sugar (sometimes requiring monitoring or treatment, especially in people with diabetes)
- Stomach irritation (your team may prescribe a stomach-protecting medication)
- Muscle weakness with longer use, and increased infection risk
- Bone thinning and other effects with prolonged use
Why you must not stop them suddenly This is crucial: after taking steroids for more than a short time, your body reduces its own steroid production. Stopping abruptly can cause a dangerous reaction. Steroids must be tapered down gradually under medical guidance — never stopped on your own.
The balancing act Your team aims to use the lowest effective dose for the shortest necessary time, because while steroids relieve symptoms, the goal is to minimize their downsides. If you're on steroids, ask about the plan to taper, how to manage side effects, and what to watch for.