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7 Things To Avoid During Radiation for Breast Cancer

Medically reviewed by Maybell Nieves, M.D.
Written by Sarah Winfrey
Updated on September 15, 2026

If you’re getting ready to have radiation for breast cancer, there’s a lot you should know. Your oncologist will probably give you a list of steps to take before your first radiation treatment.

There are also several things you should avoid while undergoing radiation for breast cancer. Keeping these in mind can improve your experience and decrease your risk of side effects.

Read on for more information about what to avoid with your radiation treatment plan.

1

Make Sure To Get Enough Sleep

When you’re undergoing radiation, you need your rest. Adequate sleep doesn’t just help you feel better during treatments — it also supports healing.

Let your body rest when it needs to and stay active when you can. If you’re fatigued, take a short nap or do another activity that you find restful and relaxing. Exercise during the day can help you sleep better at night.

Let your body rest when it needs to and stay active when you can.

2

Don’t Take Medications Without Talking to Your Doctor

Some medications and supplements can make your experience with radiation better or easier. However, others can have negative interactions with your radiation therapy.

For instance, antioxidant supplements may actually protect cancer cells against radiation treatment, which can make treatment less effective.

Be sure to keep your healthcare team informed of all your medications, including vitamins or multivitamins. That goes for prescriptions, over-the-counter meds, and dietary supplements. Don’t make changes without talking to your providers first.

3

Don’t Skip the Protein

It’s always important to eat plenty of protein, but it’s even more important when you’re undergoing radiation for breast cancer. Protein helps your body hold on to muscle.

During radiation therapy, protein can help conserve your muscle mass and repair any damage the radiation may cause. If you’re having difficulty consuming solid foods during radiation treatment, meal replacement drinks can help fill in the gaps. Ask a registered dietitian for recommendations that could work for you.

If you’re having trouble consuming solid foods during radiation treatment, meal replacement drinks can help fill in the gaps.

4

Think Twice Before Shaving Your Armpits

Many people shave their underarms regularly because they like how it looks and feels. However, you might want to cut back on shaving the affected area during radiation.

Radiation-treated areas can be sensitive and irritated. Your healthcare team may suggest an electric razor to trim armpit hair instead of shaving directly on the skin. Talk to your cancer care team to see if it’s OK to shave or if you should hold off.

5

Use Caution When Soaking Up the Sun

Doctors recommend not exposing the skin directly to the sunlight while you’re undergoing radiation treatment. However, if you enjoy the sun and it’s nice outside, you might think sunbathing will make you feel better. Just make sure you don’t expose any radiation sites to the sun.

Radiation-treated skin can be particularly sensitive to sunburns. But you may not be able to put sunscreen on the affected area right away. Seek the shade and cover your skin with clothing with ultraviolet protection factor (UPF) until it’s had a chance to fully recover from treatment.

Radiation-treated skin can be sensitive to sunburns. Seek shade and cover your skin until it’s recovered from treatment.

6

Don’t Skip Breast Cancer Radiation Skin Care

Your healthcare provider should give you some guidance and a list of products to use to care for your skin during radiation treatment. They may recommend certain lotions, sunscreens, or deodorants to help the treatment area stay in good shape during radiation.

Use the products your healthcare providers recommend during and after your treatments for better outcomes afterward. Your radiation oncologist may also advise you about clothing or bras that will help reduce skin reactions and irritation.

7

Avoid Using Heat or Cold on Your Skin

You might feel like you want to use heat (such as heating pads) or cold (such as ice packs) on your skin, especially if you’re experiencing discomfort from radiation treatment. However, extreme heat or cold may irritate your skin in the radiated area.

Avoid anything too hot or cold on the treated part of your skin for the duration of your treatment. This includes hot tubs as well as hot baths and showers. Check in with your care team on the healing process to find out when hot or cold exposure is safe for you.

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I am really scared of radiation side effects. It has been a challenge to accept gracefully this treatment. It is hard to not feel it's is a overtreatment for a DCIS. The only thing is I trust the… read more

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