Treatment & Side Effects
Side effects vary a lot from person to person, even among people getting the same treatment. This page pulls real, sourced facts from the National Cancer Institute (NCI) on the side effects people ask about most — not everything you might experience, but a solid starting point for knowing what’s normal and when to call your care team.
This is not medical advice. Always talk to your own oncology team about what to expect for your specific treatment.
Hair Loss
Caused by certain chemotherapy drugs, and by radiation therapy on the part of the body being treated. Hair usually starts growing back 2–3 months after chemo ends (sometimes finer, curlier, or a different color at first), or 3–6 months after radiation ends — though high-dose radiation to an area can mean thinner regrowth or none at all there. Real, practical tips: handle hair gently (soft brush, mild shampoo, skip heat styling), consider cutting it short or shaving ahead of time, protect your scalp with sunscreen or a hat, and know that wigs, scarves, and turbans are real options if you want them.
Fatigue
Cancer-related fatigue is different from normal tiredness — it’s often not fixed by sleep or rest, and can show up even after very little activity. It comes from several directions at once: the cancer itself competing for the body’s energy, treatments like chemo and radiation affecting healthy cells along with cancer cells, and side effects like anemia, pain, or poor sleep piling on top. Real strategies that help: staying physically active where you can, good sleep habits, working with a dietitian on nutrition, and mind-body practices like yoga or meditation.
Nausea & Vomiting
Most associated with chemotherapy (can start minutes to hours after treatment, often lasting 24–48 hours) and radiation to the brain, upper abdomen, or whole body (which can last 3–4 weeks). Real medications your care team may prescribe include ondansetron, prochlorperazine, and steroids. Non-medication approaches that can help alongside medication: staying hydrated, eating bland food in smaller, more frequent meals, avoiding strong smells, and acupressure.
Radiation Therapy, in General
Radiation works by damaging cancer cells, but it can also affect nearby healthy cells — that’s where side effects come from. They’re mostly localized to wherever you’re being treated (brain, chest, pelvis, etc.), though fatigue shows up almost universally regardless of treatment area. Most side effects resolve within a few months of finishing treatment, but some — called “late effects” — can show up months or years later, depending on treatment location and other factors. Worth asking your team specifically what late effects to watch for given your own treatment plan.
Source for the facts above: National Cancer Institute, Side Effects of Cancer Treatment →