While youre receiving treatment for cancer, some of the drugs you take can cause painful sores to develop inside your mouth. You can also get them if youve had a bone marrow (stem cell) transplant as part of your cancer care.

Although they often heal on their own, these mouth sores can make it uncomfortable to eat and talk. Well discuss what you can do to relieve the pain and prevent them from getting worse.

Mouth sores can be a common side effect of cancer treatment. The condition, known as stomatitis or mucositis, is an inflammation of the tissues inside your mouth.

Whitish, ulcer-like sores can form on your cheeks, gums, lips, tongue, or on the roof or floor of your mouth. Even if you dont develop mouth ulcers, you may have patches that feel inflamed and painful, as if theyve been burned.

Anyone who is receiving chemotherapy, radiation therapy, or a bone marrow (stem cell) transplant can develop mouth sores as a side effect of these treatments.

If you have dry mouth or gum disease, or if your teeth and gums are not well taken care of, you may be at a higher risk of getting mouth sores during your treatment. Women and people who smoke or drink alcohol are also at a higher risk, according to the Oral Cancer Foundation.

If youre receiving chemotherapy, the sores could begin forming anywhere from 5 days to 2 weeks after your treatment. Depending on the specific cause, the sores could go away on their own in a few weeks, or they could last longer.

Its important to find ways to manage your pain and to watch for signs of an infection. Cancer-related mouth sores can lead to weight loss, dehydration, and other serious complications.

Cancer cells can grow very quickly. The aim of cancer treatment is to stop or slow down that growth. The cells in the mucous membranes lining your mouth are also fast-growing cells, so cancer treatments affect them, too.

Cancer treatments also keep the cells in your mouth from being able to repair themselves efficiently when theyre damaged.

Radiation therapy can also damage the glands in your mouth that make saliva. A dry mouth is more susceptible to infections that cause mouth sores.

Chemotherapy and radiation can both change the microbiome in your mouth, upsetting the balance between good and bad bacteria. The growth of harmful bacteria in your mouth can also lead to mouth sores.

Sometimes cancer treatments suppress your immune system, which may make it more likely that youll get a bacterial, viral, or fungal infection that causes mouth sores. An older infection (such as the herpes simplex virus) can also suddenly flare up again.

If youve had a bone marrow (stem cell) transplant, sores may be a sign that youve developed a condition known as graft-versus-host disease (GVHD).

When this happens, the cells in your body are attacking the transplanted cells as though they were an unhealthy invader. According to research published in Journal of Clinical and Experimental Dentistry, short-term (acute) GVHD occurs in 50 to 70 percent of stem cell transplant cases and longer-term (chronic) GVHD is seen in 30 to 50 percent of cases.

The form of GVHD that causes mouth sores is usually mild, and doctors often treat it with corticosteroid medications.

Its important to talk with your doctor if you develop mouth sores after a stem cell transplant, as some kinds of GVHD can turn serious if left untreated.

There is a good chance that youll experience mouth sores at some point during your cancer treatment. Researchers estimate that 20 to 40 percent of those who have chemotherapy and 80 percent of those who have high-dose chemotherapy will develop mucositis afterward.

Still, there are steps you and your cancer care team can take to lower your risk, reduce the severity of the sores, and promote faster healing.

About a month before your cancer treatment begins, schedule an appointment with your dentist to make sure your teeth and gums are healthy. If you have cavities, broken teeth, or gum disease, its important to come up with a dental treatment plan to take care of these conditions so they dont lead to infections later, when your immune system may be vulnerable.

If you wear braces or dentures, ask your dentist to check the fit and remove any part of the device you dont need during your treatment.

Its very important to maintain good oral hygiene practices throughout your treatment to lower your risk of infection. Brush and floss gently but regularly, avoiding any painful areas. You can also ask your dentist whether a mouth rinse with fluoride is advisable in your case.

For certain kinds of chemotherapy (bolus 5fluorouracil chemotherapy and some high-dose therapies), your healthcare team may give you ice chips to chew for 30 minutes before your treatment. This type of cold therapy can lower your risk of getting mouth sores later.

During treatment of some blood cancers, doctors may give you injections of palifermin, also known as human keratinocyte growth factor-1 (KGF-1), to prevent mouth sores.

If youre scheduled to receive high-dose chemotherapy or radiotherapy, your cancer care team may prepare your mouth using low-level laser therapy beforehand to keep you from getting mouth sores.

For people who have radiation therapy for head and neck cancers, doctors may prescribe this medicated mouthwash to minimize mouth sores.

The length of time your mouth sores may last depends on the specific cancer treatment youve had. Here are some estimates broken down by treatment:

You may notice symptoms anywhere between a few days and a few weeks after your cancer treatment. Heres what you may see and feel as mucositis develops:

You may notice that the sores become slightly crusty as they heal. Its important to keep track of your symptoms and let your oncologist know if the sores arent healing on their own.

Contact your doctor right away if you:

Untreated mouth sores can lead to malnutrition, dehydration, and life-threatening infections.

There are a few different ways that you can help mouth sores heal and avoid prolonger pain or an infection.

While the sores are healing, its very important to keep the inside of your mouth clean to prevent an infection from developing.

The National Cancer Institute recommends that you gently clean your teeth every 4 hours and just before you go to sleep at night. Here are a few tips to consider:

If the pain from mouth sores is interfering with your ability to eat and drink, your doctor may treat the condition with a opioid mouthwash or one containing doxepin or lidocaine.

To ease discomfort and keep your mouth from feeling dry, you may want to try rinsing with a mild saltwater or baking soda solution. Heres how to make each of them:

Your cancer care team may recommend that you use a lubricating liquid (artificial saliva) to moisten the inside of your mouth if dryness is a problem. These liquids are usually gel-like. They coat your mouth with a thin film to help ease discomfort and promote healing.

Some people have found it useful to rinse with a blend of medications called the magic mouthwash. Formulas for this mouthwash vary, but most of them include a combination of medications to treat different symptoms, including:

Magic or miracle mouthwash solutions usually have to be prescribed by a doctor and prepared by a pharmacist, although some people mix up an over-the-counter version at home.

There isnt enough research to say for sure whether magic mouthwash works. If you think youd like to try it, talk with your oncologist or a healthcare professional about whether its a good idea for you.

Here are a few more things you can try at home that may help ease pain from mouth sores:

Mouth sores are one of the most common side effects of cancer treatment. Shortly after chemotherapy, radiation, or transplant treatments, painful, ulcer-like sores can form on the inside of your mouth.

These sores may go away on their own. If they dont, its important to seek medical treatment for them because they can lead to very serious complications.

Before you start cancer treatments, visit a dentist to make sure your teeth and gums are healthy. Keeping up good dental hygiene practices during and after cancer treatment will help limit mouth sores.

If the sores are keeping you from eating and drinking, talk with your oncologist about medications could relieve the pain and speed up the healing process, so you can enjoy a better quality of life during treatment.

Its really important to keep track of any sores in your mouth so you can reach out to your healthcare team if they dont improve. Sores that deepen or worsen can lead to serious even life-threatening complications.

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Mouth Sores from Chemo: Symptoms, Causes, and Treatments - Healthline

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