After head and neck cancer treatment: dry mouth, swallowing, voice and bone
- Topic
Surgery and radiotherapy of the head and neck leave lasting effects on saliva, teeth, swallowing, voice and jaw bone that the general doctor helps manage.
What it is
Head and neck cancer survivors live with the effects of surgery, radiotherapy and chemotherapy for years. Radiation damages salivary glands, mucosa, teeth, jaw bone and thyroid; neck surgery can cause lymphoedema, numbness and shoulder weakness. The general doctor sees these patients between oncology visits and should recognise the late effects, prevent complications (above all dental) and spot signs of recurrence.
Late effects and what to do in primary care
| Effect | Cause | What helps |
|---|---|---|
| Dry mouth (xerostomia) | Radiation damage to salivary glands | Sipping water, sugar-free gum, saliva substitutes; saliva stimulants (pilocarpine) if local measures fail |
| Tooth decay and oral infection | Lack of saliva | Strict oral hygiene, regular dental review, treatment of candidiasis |
| Mucositis | Radiation or chemotherapy on the mucosa | Mouth care, pain control, nutritional support |
| Osteoradionecrosis | Irradiated jaw bone, often after extraction | Avoid extractions without the specialist; refer |
| Swallowing and voice problems | Surgery, radiation fibrosis | Speech and swallowing therapy |
| Jaw stiffness | Radiation of chewing muscles | Jaw exercises, therapy |
| Neck and shoulder | Neck dissection: lymphoedema, numbness, shoulder weakness | Physiotherapy, lymphoedema care |
| Hypothyroidism | Radiation of the thyroid | Thyroid function tests and replacement |
In clinical practice
- Dental assessment and treatment are ideally completed before radiotherapy, because extractions later in irradiated bone can trigger osteoradionecrosis.
- Persistent pain, a new ulcer, a neck lump, weight loss or a voice change in a survivor may be recurrence rather than a late effect.
- Aspiration can be silent after treatment; recurrent chest infections suggest unsafe swallowing.
Next step / Initial management
- At each visit examine the mouth and neck, check weight and ask about swallowing, voice, pain and dental problems.
- Request thyroid function tests periodically after neck radiation and treat hypothyroidism with levothyroxine.
- Manage dry mouth with local measures and saliva substitutes; arrange dental review and do not extract teeth in irradiated bone without the treating team.
- Refer urgently (same week) to the oncology or head and neck team for a new lump, a non-healing ulcer, exposed bone, progressive dysphagia or weight loss; refer the same day if there is stridor or the patient cannot swallow.
- Refer on a routine basis to speech and swallowing therapy, physiotherapy or nutrition when function is limited.
Test yourself
Think of the answer, then tap the question to see it.
A patient irradiated for oral cancer two years ago has exposed bone in the mandible after a tooth extraction. What is the likely diagnosis?
Osteoradionecrosis of the mandible: irradiated bone that fails to heal, classically after an extraction; refer to the head and neck team.
Which blood test should be checked periodically after neck radiotherapy?
Thyroid function (TSH), because hypothyroidism is common after radiation to the neck.
Why is a dental assessment done before head and neck radiotherapy?
To treat or remove diseased teeth beforehand, because extractions in irradiated bone can cause osteoradionecrosis and dry mouth later increases decay.
Connections
Educational content; it does not replace a medical assessment and is not a clinical instruction. For a real case, follow current guidelines and specialist advice.
Sources: Head and Neck Cancers (National Cancer Institute (NIH), 2021); Xerostomia (StatPearls (NCBI Bookshelf), 2023); Oral Mucositis (StatPearls (NCBI Bookshelf), 2023); Mandible Osteoradionecrosis (StatPearls (NCBI Bookshelf), 2026); Dry Mouth (National Institute of Dental and Craniofacial Research (NIH), 2024); Metastatic Squamous Neck Cancer With Occult Primary Treatment (PDQ), Health Professional Version (National Cancer Institute (NIH), 2025).
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Representative model, for educational purposes only.