Radiation Therapy Demystified

Dr. Aswin
August 28, 2024

It's Not Like the Movies: Understanding Radiotherapy

When patients hear "radiation," they often think of burns or nuclear disasters. In reality, modern radiation therapy is one of the most precise and safe tools we have against cancer. It uses high-energy particles (x-rays, gamma rays, protons) to destroy or damage cancer cells.

How Does It Work?

Radiation works by making small breaks in the DNA inside cells. These breaks keep cancer cells from growing and dividing and cause them to die. Nearby normal cells can also be affected, but they can repair themselves in a way that cancer cells cannot.

Types of Radiation Therapy

1. External Beam Radiation (EBRT)

This is the most common type. A machine basically "photocopies" high-energy beams into your tumor from outside the body. You lie entirely still, usually with a custom mold to keep you in place. It is painless and feels just like getting an X-ray.

IMRT / IGRT: Advanced forms that shape the beam to match the tumor perfectly, sparing healthy tissue.
Radiosurgery (CyberKnife/Gamma Knife): Ultra-precise, high-dose radiation used for brain or spine tumors in just 1-5 sessions.

2. Internal Radiation (Brachytherapy)

A radioactive source is placed inside your body, into or near the tumor. This allows a very high dose to the tumor with very little dose to surrounding organs. It is commonly used for cervical, prostate, and breast cancers.

Common Fears vs Reality

Will I be radioactive? Can I hug my kids?

With external radiation (EBRT), NO. You do not become radioactive. It is safe to be around pregnant women and children immediately after your session. For internal radiation (implants), you may have temporary restrictions.

Will it burn my skin?

You may get a skin reaction that looks like a sunburn (redness, dryness) in the treatment area only. It usually heals within a few weeks of finishing treatment. We prescribe specific lotions to manage this.

What to Expect During Treatment

Treatment usually happens 5 days a week (Monday-Friday) for several weeks. Each session takes only about 15-30 minutes.

Side Effect Timeline: What to Expect When

Radiation side effects don't start immediately. They build up over time (cumulative effect).

Week	Possible Side Effects
Week 1-2	Usually no side effects. You will feel normal.
Week 3-4	Mild fatigue sets in. Skin may start turning pink/red (like a mild sunburn).
Week 5-6	Fatigue increases (need afternoon naps). Skin may peel or darken. Sore throat (if treating head/neck).
Post-Treatment	Side effects peak 1-2 weeks after radiation ends, then gradually fade. Most are gone by 4-6 weeks post-treatment.

Skin Care During Radiation

Think of your treated skin as "sun-sensitive."

Do: Wash with lukewarm water and mild, fragrance-free soap (like Dove or baby soap). Pat dry—don't rub.
Do: Wear loose, cotton clothing.
Don't: Apply ice packs, heating pads, or adhesive tape to the area.
Don't: Use perfumes, deodorants, or powders on the treated skin unless approved by us.

Nutrition During Radiation

Radiation burns calories as your body repairs itself.

Hydration: Drink at least 2-3 liters of water daily to flush out toxins.
Protein: Essential for tissue repair. Include eggs, paneer, lentils, or lean meats.
Avoid: Spicy, acidic, or very crunchy foods if you are receiving radiation to the throat or chest.

Radiation Safety: Protecting Your Family

A common worry is, "Can I hug my children after treatment?"

External Beam Radiation: You do NOT become radioactive. It is safe to hug, kiss, and sleep in the same bed as your family immediately after treatment.
Brachytherapy (Internal Radiation): If you have seeds implanted, there may be temporary restrictions. Always check with your doctor for this specific type.

Life After Radiation: Long-Term Care

Radiation effects can linger. Years later, you might notice changes in the treated area:

Fibrosis: The treated area may feel stiffer or thicker over time. Stretching helps.
Secondary Cancers: There is a very small risk of a new cancer decades later, but the benefit of curing the current cancer far outweighs this risk. Regular check-ups are key.

Frequently Asked Questions

Does radiation cause hair loss?

Only in the area being treated. If you are getting radiation to your hip, you will not lose hair on your head. If treating the brain, you will lose scalp hair.

Can I drive myself to treatment?

Yes, most patients drive themselves during the early weeks. Towards the end, fatigue might make driving unsafe, so having a backup driver is a good plan.

Will I glow in the dark?

No. This is a movie myth. You leave the treatment room completely radiation-free.