Radiation Therapy After Surgery: What Head and Neck Cancer Patients Should Know

For many patients, surgery is not the end of treatment — it’s the beginning of a longer road. When I perform a major head and neck cancer resection, one of the questions I hear most often in the days that follow is: Will I need radiation? It depends, and the recommendation comes from a careful review of your pathology, your anatomy, and your overall health. If radiation is recommended, knowing what to expect — why it’s done, what it feels like, and how to get through it — makes the process considerably less frightening.

Why Radiation Is Recommended After Surgery

Surgery is designed to remove the tumor and create a margin of normal tissue around it. In an ideal world, that’s sufficient. In practice, head and neck cancers frequently spread in ways that make a purely surgical cure difficult to achieve. The cancer may have grown close to or into critical structures. It may have traveled to lymph nodes. It may have crept along the sheaths of nerves or invaded small blood vessels — features called perineural invasion and lymphovascular invasion, respectively. When any of these pathologic findings are present, the risk of microscopic disease remaining in the surgical bed is high enough that radiation to the area is the standard of care.

The specific features that prompt a recommendation for adjuvant (post-surgical) radiation include: positive or close surgical margins, spread to lymph nodes, perineural invasion, lymphovascular invasion, and a pathologic finding called extranodal extension — where cancer breaks through the wall of a lymph node into the surrounding fat and tissue. When I present a case at our multidisciplinary tumor board at St. Luke’s, these are the factors our radiation oncology colleagues examine most closely when formulating their recommendations.

It is worth stating clearly: adjuvant radiation does not mean we know tumor was left behind, or a sign that surgery failed. It is a deliberate strategy to lower the risk of the cancer returning. The combination of surgery and radiation achieves better local control for many head and neck cancers than either treatment alone.

When Does Radiation Begin?

Timing matters. The standard recommendation is to begin adjuvant radiation within six weeks of surgery. The reason for this window is that microscopic residual tumor cells, if present, begin dividing relatively quickly once the primary tumor is removed. Delaying treatment gives those cells more time to proliferate.

In practice, six weeks is also the time your body typically needs to heal to a degree that allows you to tolerate radiation safely. Wound healing, swallowing rehabilitation, and in some cases tracheostomy management all need to be sufficiently advanced before radiation starts. My goal — and the goal of the entire team — is to have you as well-recovered as possible before treatment begins, while not exceeding that six-week window.

Radiation for head and neck cancer typically runs six to seven weeks, with daily treatment Monday through Friday. Each session is short, usually fifteen to twenty minutes, though you may spend more time in the waiting room than under the machine. The treatments themselves are painless. The side effects, however, accumulate over the course of treatment.

Chemotherapy: When It’s Added

For patients with the highest-risk features — specifically, extranodal extension of tumor into the surrounding soft tissue, or positive surgical margins — the standard of care is concurrent chemoradiation: radiation delivered simultaneously with platinum-based chemotherapy, most commonly cisplatin. This combination is more effective than radiation alone for controlling microscopic disease in high-risk patients, demonstrated in landmark trials by Cooper and colleagues and Bernier and colleagues published in the New England Journal of Medicine.[1][2]

Adding chemotherapy increases both the effectiveness and the toxicity of treatment. Cisplatin causes nausea, kidney stress, and hearing changes in some patients, and it intensifies the radiation-related side effects in the mouth and throat. For patients who cannot tolerate full-dose cisplatin — due to kidney function, hearing loss, or other health conditions — our oncology team frequently uses alternative regimens. The decision is made carefully and individually.

What to Expect During Treatment

The side effects of head and neck radiation build gradually and tend to peak in the final weeks of treatment and the first few weeks after it ends. The most significant include:

Mucositis — inflammation and breakdown of the mucous membranes lining the mouth and throat. This can range from mild soreness to severe pain that makes eating difficult. Most patients require adjustments in diet and, in some cases, a feeding tube placed through the nose or directly into the stomach (a PEG tube) to maintain adequate nutrition.

Xerostomia — dry mouth caused by damage to the salivary glands within the radiation field. Saliva production may recover partially over the following year, or the dryness may be long-lasting depending on the location and dose of radiation. Our radiation oncologists use techniques such as intensity-modulated radiation therapy (IMRT) specifically to spare the parotid glands as much as possible.

Swallowing difficulty — radiation causes inflammation and, over time, scarring of the muscles and soft tissues involved in swallowing. Speech and swallowing therapy, started proactively during and after treatment, significantly reduces the long-term impact of this side effect. I strongly encourage all of my patients going into radiation to begin working with a speech-language pathologist before treatment, not after.

Fatigue — increases gradually. This is not ordinary tiredness. Most patients find their energy progressively decreasing through the course of treatment and need several weeks to months to recover afterward.

Skin changes — the skin in the radiation field becomes progressively red, dry, and tender, similar in some ways to a prolonged sunburn. This heals after treatment ends.

Taste changes — many patients report that food tastes abnormal or absent during and after radiation. Taste frequently improves over the six to twelve months following treatment.

How to Prepare Yourself

There are concrete steps that make radiation more manageable. Before treatment begins, you will need a comprehensive dental evaluation. Radiation to the jaw area increases the risk of a serious complication called osteoradionecrosis — damage to the jawbone — and diseased teeth in the radiation field need to be addressed beforehand. This is not optional, and I arrange these evaluations well in advance for my patients.

Nutritional status going into radiation matters. The better your nutritional baseline at the start of treatment, the more reserve you have when eating becomes difficult. If you are already struggling with weight or eating at the time of surgery, I will discuss the role of early feeding tube placement with you.

Smoking cessation is essential. Continuing to smoke during radiation dramatically reduces its effectiveness and increases toxicity. If nicotine dependence is a barrier, our team will connect you with support.

Finally, lean on your support system. Radiation is logistically demanding — five days a week for six to seven weeks — and the side effects accumulate in ways that make it difficult to manage entirely on your own. Having a reliable person available to drive you to appointments and help at home is genuinely important.

The Period After Radiation Ends

Recovery after head and neck radiation takes time. Many patients feel their worst in the first two to four weeks after completing treatment, as cumulative effects continue to peak. From there, the trajectory is gradual improvement. Salivary function, swallowing, energy, and taste all tend to improve over the following six to twelve months, though for some patients the recovery is incomplete.

Surveillance after treatment — monitoring for recurrence — begins approximately three months after the end of radiation and continues at regular intervals. I remain actively involved in your follow-up care, coordinating with your medical and radiation oncology team.

If radiation has been recommended as part of your treatment plan, I encourage you to discuss it thoroughly with the radiation oncologist who will be delivering it. Ask about the specific areas being treated, the technique being used, and what monitoring will take place along the way. You should understand the purpose of every phase of your treatment.

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If you have been diagnosed with head and neck cancer and want to discuss whether radiation is part of the right approach for you, I welcome that conversation. Please call my office at 414-649-3920 to schedule a consultation.

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Dr. Steven Sperry is a fellowship-trained head and neck surgeon specializing in head and neck cancer surgery and microvascular free flap reconstruction at Aurora St. Luke’s Medical Center in Milwaukee, Wisconsin.