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Mouth soresDefinition Various types of sores can appear anywhere within the mouth, including the inner cheeks, gums, tongue, lips, or palate.Common Causes Most mouth sores are cold sores (also called fever blisters), canker sores, or a mechanical irritation caused by:
Cold sores are caused by herpes simplex virus and are very contagious. Usually, you have tenderness, tingling, or burning before the actual sore appears. Herpes sores begin as blisters and then crust over. The herpes virus can reside in your body for years, appearing as a mouth sore only when something provokes it. Such circumstances may include another illness, especially if there is a fever, stress, hormonal changes (like menstruation), and sun exposure. Canker sores are NOT contagious and can appear as a single pale or yellow ulcer with a red outer ring, or as a cluster of such lesions. The cause of canker sores is not entirely clear, but may be related to:
For unknown reasons, women seem to get canker sores more often than men. This may be related to hormonal changes. Less commonly, mouth sores can be a sign of an underlying illness, tumor, or reaction to a medication. Such potential illnesses can be grouped into several broad categories:
Drugs that might cause mouth sores include chemotherapeutic agents for cancer, aspirin, barbiturates (used for insomnia), gold (used for rheumatoid arthritis), penicillin, phenytoin (used for seizures), streptomycin, or sulfonamides. Home Care Mouth sores generally last 10 to 14 days, even if you don't do anything. They sometimes last up to 6 weeks. The following steps can make you feel better:
For canker sores:
Nonprescription preparations, like Orabase, can protect a sore inside the lip and on the gums. Blistex or Campho-Phenique may provide some relief of canker sores and fever blisters, especially if applied when the sore initially appears. Additional steps that may help cold sores or fever blisters:
Anti-viral medications for herpes lesions of the mouth may be recommended by your doctor. Some experts feel that they shorten the time that the blisters are present, while others claim that these drugs make no difference. Call your health care provider if Call your doctor if:
What to expect at your health care provider's office Your doctor will perform a physical examination, focusing on your mouth and tongue. Medical history questions may include the following:
Treatment may depend on the underlying cause of the mouth sore. A topical anesthetic (applied to a localized area of the skin) such as lidocaine or xylocaine may be used to relieve pain (but should be avoided in children). An antifungal medication may be prescribed for oral thrush (a yeast infection). An anti-viral medication may be prescribed for herpes lesions (although, some feel that this does not shorten the length of time that the lesions are present), and antibiotics may be prescribed for severe or persistent canker sores. Prevention You can reduce your chance of getting common mouth sores by:
To avoid mechanical irritation, also:
If you seem to get canker sores often, talk to your doctor about taking folate and vitamin B12 to prevent outbreaks. If you get cold sores often, taking L-lysine tablets or increasing lysine in your diet (found in fish, chicken, eggs, and potatoes) may reduce outbreaks. However, if you have high cholesterol, heart disease, or high triglycerides, DO NOT use L-lysine. To prevent the spread of herpes sores, do not kiss or have oral sex with someone with a cold sore or fever blister. Do not participate in these activities when you have an active cold sore. Do not share razors, lip balm, toothbrushes, or lipsticks. To prevent cancerous mouth lesions:
References Mandell GL, Bennett JE, Dolin R. Principles and Practice of Infectious Diseases. 5th ed. London, UK: Churchill Livingstone, Inc.; 2000. Yeung-Yue KA. Herpes simplex viruses 1 and 2. Dermatol Clin. 2002; 20(2): 249-266. MacDonald J. Canker sore remedies: baking soda. CMAJ. 2002; 166(7): 884. Illustrations
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