What Is Radiation Therapy

Radiation therapy is a cancer treatment that uses high-energy rays to kill cancer cells.

It damages the DNA inside cancer cells so they cannot grow or divide.

Over time, the damaged cancer cells die.

Radiation therapy is one of the most common cancer treatments.

Learn more:
Cancer Treatment Explained
https://helping4cancer.com/cancer-treatment/

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How Radiation Therapy Works

Radiation uses:

• X-rays
• Gamma rays
• Proton beams

These beams target cancer cells and break their DNA.

Cancer cells have a harder time repairing DNA damage than normal cells.

That is why radiation can shrink or destroy tumors.

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Types of Radiation Therapy

External Beam Radiation Therapy (EBRT)

This is the most common type.

A machine directs radiation at the tumor from outside the body.

It is painless and similar to getting an X-ray.

Most patients receive treatments 5 days a week for several weeks.

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Internal Radiation Therapy (Brachytherapy)

Radioactive material is placed inside or near the tumor.

This allows a high dose of radiation directly to the cancer.

Commonly used for:

• Prostate cancer
• Cervical cancer
• Breast cancer

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Proton Therapy

A newer form of radiation.

Uses proton particles instead of X-rays.

It may reduce damage to nearby healthy tissues.

Used in:

• Brain tumors
• Pediatric cancers
• Tumors near sensitive organs

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Why Radiation Is Given

Radiation therapy may be used to:

• Cure cancer
• Shrink tumors before surgery
• Kill remaining cancer after surgery
• Relieve symptoms (palliative treatment)

It may be combined with:

• Surgery
• Chemotherapy
• Immunotherapy

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Does Radiation Hurt

Radiation treatment itself does not hurt.

You do not feel the radiation.

However, side effects may develop gradually during treatment.

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How Long Radiation Therapy Lasts

Treatment schedules vary depending on:

• Cancer type
• Tumor size
• Location
• Treatment goal

Some treatments last:

• A few days
• Several weeks

Each session usually lasts only a few minutes.

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Is Radiation Therapy Safe

Radiation therapy is carefully planned using imaging scans.

Doctors calculate the dose to:

• Maximize cancer damage
• Minimize harm to healthy tissue

Modern technology has improved safety significantly.

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What Happens Before Radiation Treatment

Before starting radiation:

• Imaging scans map the tumor
• Doctors create a treatment plan
• Small skin marks may guide positioning

This planning process ensures precision.

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Can Radiation Cure Cancer

Yes.

For some early-stage cancers, radiation alone can cure the disease.

In other cases, it helps improve survival when combined with other treatments.

Learn more:
Is Cancer Curable
https://helping4cancer.com/is-cancer-curable/

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Key Takeaways

Radiation therapy uses high-energy rays to damage cancer cell DNA.

It can cure, shrink, or control cancer.

External beam radiation is the most common type.

Modern radiation is highly targeted and carefully planned.

Treatment is painless, though side effects can occur over time.

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External References

National Cancer Institute – Radiation Therapy
https://www.cancer.gov/about-cancer/treatment/types/radiation-therapy

American Cancer Society
https://www.cancer.org/

RadiologyInfo.org (RSNA & ACR)
https://www.radiologyinfo.org/