Radiation Therapy

Radiation Therapy


Due to how challenging cancer treatment is, scientists and physicians are always looking for innovative techniques to treat this debilitating disease.

One of the problems we face in cancer therapy is the principle of targeting. You see, chemotherapy is extremely effective at destroying growing cells rapidly.

However, its major defect is that it doesn’t distinguish between healthy and cancer cells. For this reason, we always had to deal with serious side effects that accompany cancer treatment.

One of the fields that relatively managed to escape this loophole is radiation therapy.

By developing advanced machines to target the tumor regardless of its location inside the body, we significantly reduced these side effects.

In our previous articles, we covered how cancer can be treated with tumor removal and chemotherapy. Now, it’s time to talk about radiation therapy.

What is radiation therapy?

Radiation therapy involves the use of external radiation beams to kill cancer cells. It is a highly targeted therapy that could destroy the DNA of cancer cells to eradicate them.

According to the National Institute of Cancer, 50% of patients diagnosed with cancer will undergo radiation therapy.

Note that radiation therapy doesn’t immediately kill the cancer cells. It will take a couple of weeks before their DNA is damaged beyond repair, and the cells die.

Radiation therapy is usually combined with chemotherapy and surgical oncology to eradicate cancer from the body completely.

Who needs radiation therapy?

Radiation therapy is used to treat patients with cancer or reduce their symptoms. It can also be used to kill any remaining cancerous cells after performing the surgical removal of the tumor.

You might be asking yourself, “if the radiation is capable of killing cancer cells, wouldn’t it also kill normal cells?”

The answer is yes. However, the damage inflicted on normal cells is minimal, and they can easily regenerate.

Moreover, with the advancement of radiation oncology, physicians can specifically target one small area of the body to hit it with a beam of radiation.

Before getting approved to receive radiation therapy, there is a long testing and evaluation process, as not all patients may benefit from this treatment.

The procedure of radiation therapy

Radiation therapy is usually programmed five days a week. The patient will be off therapy during the weekend to give some time for the normal cells to regenerate.

Each treatment session takes between 10-30 minutes.

Once you arrive at the radiation center, the radiotherapy team will position you on a table. Some protective shields might be used to reduce the exposure of other areas to radiation.

The machine that delivers the radiation beams is called a linear accelerator. it points the beams at a specific location of your body and moves to change angles to avoid exposing a single part of the skin to the beams.

After getting a few sessions, your physician will be closely monitored to see how your body responds to treatment.

Additionally, some imaging tests might be ordered to observe the tumor response to treatment.

Your physician will then adjust your dose and treatment sessions, depending on how you respond to therapy.

To get more information about your case, do not hesitate to contact Hayatmed for a free consultation.

Side effects

Despite the type of cancer you have, radiation therapy is known to cause general fatigue and hair loss in the area exposed to therapy.

Here are some of the most common side effects:

Acute side effects

  1. Digestive symptoms

While not typically seen in all patients, nausea and vomiting are especially prevalent in patients who get radiation therapy to their abdomen or a central nervous system structure that controls these reactions, such as the inner ear and vestibular system.

  1. Oral sores          

This is usually due to non-targeted infused beams that damage the epithelial lining of the oral cavity. If the treatment is targeted to the neck, esophageal sores can also occur.

Patients might start to complain about the inability to ingest food. Support therapy and fluids might be a good option for this subset of patients.

  1. Swelling

Radiation beams will induce inflammation in the targeted area, especially at the level of soft tissue.

This can pose a problem if the swelling occurs inside the brain when treating cerebral tumors.

As you may know, the brain is confined by the skull, and any extra pressure may lead to intracranial hypertension and a life-threatening condition known as brain herniation.

  1. Skin damage

Even though radiation therapy is targeted to reach peak intensity at the level of the tumor, the skin is still affected and can show these symptoms:

  • Blistering
  • Dryness
  • Itching
  • Peeling

Late side effects

  1. Hair loss

This sign depends on the dose of radiation you receive. If the dose is low, hair loss might be reversible.

However, if it exceeds 10 Gy (unit to measure radiation beams) in one dose, the hair loss is typically irreversible.

  1. Fibrosis

Because radiation therapy induces inflammation, scar tissue starts to deposit after activation of fibroblasts.

This could make the affected area less elastic.

  1. Cardiovascular disease

Radiation therapy for breast cancer increases the risk of cardiovascular diseases.

These include cardiomyopathy, myocardial fibrosis, valvular heart disease, coronary artery disease, and heart arrhythmias.

  1. Cognitive decline

Radiation therapy has been documented to cause cognitive decline in patients who have brain tumors, and the beams are pointed at their skulls.


Radiation therapy is a great technique to specifically target some tissues without performing invasive procedures, such as surgery.

Over time, this technique has become more efficient than ever, where an entire subspecialty in medicine is dedicated to treating cancer patients with radiotherapy.

If you have questions about radiation therapy, feel free to ask them in the comment section below.

Additionally, don’t forget to check our other articles about chemotherapy and Tumor Removal Surgery.

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