Salivary glands make saliva, which keeps your mouth moist and helps you digest food. You have three pairs of major salivary glands — in front of each ear (parotid), under your tongue (sublingual) and below your jawbone (submandibular). In addition, hundreds of tiny salivary glands line your mouth, nose and throat.
Most large salivary gland tumors start in the parotid glands. Most small salivary gland tumors start in the roof of the mouth (palate). Salivary gland cancers are rare — more than half the salivary gland tumors are not cancerous (benign). In most cases, the cause isn't known, but risk factors may include older age, radiation treatment to the head and neck, and workplace exposure to certain substances.
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