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Orofacial Pain in Cancer: Part II—Clinical Perspectives and Management

¹ Department of Oral Medicine and Diagnostic Sciences, MC-838, College of Dentistry, 801 S. Paulina St., Chicago, IL 60612, USA;
² Department of Oral Medicine, the Hebrew University, Hadassah Faculty of Dental Medicine Jerusalem, Israel; and
³ Universities of Medicine and Dentistry at New Jersey, New Jersey Dental School, 110 Bergen Street, Newark, NJ 07103, USA

^* corresponding author, jepstein{at}uic.edu

Cancer-associated pain is extremely common and is associated with significant physical and psychological suffering. Unfortunately, pain associated with cancer or its treatment is frequently under-treated, probably due to several factors, including phobia of opioids, under-reporting by patients, and under-diagnosis by healthcare workers. The most common etiology of cancer pain is local tumor invasion (primary or metastatic), involving inflammatory and neuropathic mechanisms; these have been reviewed in Part I. As malignant disease advances, pain usually becomes more frequent and more intense. Additional expressions of orofacial cancer pain include distant tumor effects, involving paraneoplastic mechanisms. Pain secondary to cancer therapy varies with the treatment modalities used: Chemo-radiotherapy protocols are typically associated with painful mucositis and neurotoxicity. Surgical therapies often result in nerve and tissue damage, leading, in the long term, to myofascial and neuropathic pain syndromes. In the present article, we review the clinical presentation of cancer-associated orofacial pain at various stages: initial diagnosis, during therapy (chemo-, radiotherapy, surgery), and in the post-therapy period. As a presenting symptom of orofacial cancer, pain is often of low intensity and diagnostically unreliable. Diagnosis, treatment, and prevention of pain in cancer require knowledge of the presenting characteristics, factors, and mechanisms involved.

KEY WORDS: orofacial pain in cancer • quality of life • management