Canker Sores: Causes, Symptoms, and Treatment

What is Canker Sores?

Canker sores, also known as aphthous ulcers, are small, shallow lesions that develop on the soft tissues in your mouth or at the base of your gums. Unlike cold sores, canker sores don't occur on the surface of your lips and they aren't contagious. They can be painful, however, and can make eating and talking difficult.

Canker sores are one of the most common types of mouth ulcers. They typically appear as round or oval sores with a white or yellow center and a red border. Most canker sores are minor and heal on their own in one to two weeks. However, major canker sores can be larger, deeper, and more painful, and may take up to six weeks to heal.

Source: Mayo Clinic

Common Causes

The exact cause of canker sores remains unclear, though researchers suspect a combination of factors contributes to outbreaks. Here are some common triggers and associated conditions:

• Minor mouth injury: From dental work, aggressive brushing, sports accidents, or accidental cheek bites.
• Toothpastes and mouth rinses: Containing sodium lauryl sulfate, which may trigger sores in some individuals.
• Food sensitivities: Particularly to acidic or spicy foods, such as citrus fruits, tomatoes, strawberries, chocolate, and coffee.
• Nutritional deficiencies: Lack of essential vitamins and minerals, including vitamin B-12, zinc, folate (folic acid), or iron.
• Hormonal shifts: Many women experience canker sores during their menstrual cycle due to hormonal changes.
• Stress and anxiety: Emotional stress is a well-documented trigger for canker sores.
• Certain medical conditions:
  • Celiac disease (a serious intestinal disorder caused by gluten sensitivity)
  • Inflammatory bowel diseases (IBD), such as Crohn's disease or ulcerative colitis
  • Behçet's disease (a rare disorder causing inflammation throughout the body)
  • HIV/AIDS (which suppresses the immune system)
• Weakened immune system: Due to illness, fatigue, or immune-suppressing conditions or medications.
• Allergic responses: To certain bacteria in the mouth.
• Genetics: A family history of canker sores may increase your risk.

Sources: Harvard Health, National Institute of Dental and Craniofacial Research (NIDCR)

Associated Symptoms

Canker sores are usually easy to identify by their appearance and the discomfort they cause. Common symptoms include:

• A painful sore or sores inside your mouth — on the tongue, soft palate (the back portion of the roof of your mouth), or inside your cheeks
• A tingling or burning sensation prior to the appearance of the sores
• Sores that are round, white or gray in color, with a red edge or border
• Difficulty eating, drinking, or talking due to pain
• In severe cases, you may also experience:
  • Fever
  • Physical sluggishness
  • Swollen lymph nodes

It's important to note that canker sores are not the same as cold sores (fever blisters), which are caused by the herpes simplex virus and are highly contagious.

Source: Centers for Disease Control and Prevention (CDC)

When to See a Doctor

Most canker sores don't require medical treatment and will heal on their own. However, you should consult a healthcare provider if you experience any of the following:

• Unusually large sores
• Sores that are spreading
• Sores that last more than two weeks
• Intolerable pain despite avoiding trigger foods and using over-the-counter treatments
• Difficulty drinking enough fluids
• High fever accompanying the canker sores
• Frequent outbreaks (more than two or three times a year)

Additionally, if you notice canker sores appearing alongside other symptoms such as joint pain, fever, or rashes, it could indicate an underlying health condition that requires medical evaluation.

Source: Cleveland Clinic

Diagnosis

In most cases, your doctor or dentist can diagnose canker sores with a visual examination. During the exam, they will check the appearance and location of the sores to rule out other conditions such as:

• Cold sores
• Oral thrush (a fungal infection)
• Oral lichen planus (an inflammatory condition)
• Other types of mouth ulcers

If your canker sores are severe, recurrent, or accompanied by other symptoms, your doctor may recommend additional tests to check for nutritional deficiencies, immune system disorders, or other medical conditions. These tests may include:

• Blood tests to check for vitamin deficiencies, anemia, or celiac disease
• Allergy tests to identify potential food triggers
• Biopsy of the sore (in rare cases) to rule out other conditions

Source: Mayo Clinic

Treatment Options

Treatment for canker sores generally focuses on relieving pain, speeding up healing, and preventing recurrence. Here are some common treatment options:

Medical Treatments

• Mouth rinses: Prescription mouth rinses containing dexamethasone, lidocaine, or tetracycline can reduce pain and inflammation.
• Topical products: Over-the-counter or prescription gels, pastes, or creams such as benzocaine (Orajel), fluocinonide (Lidex), or amlexanox (Aphthasol) can help relieve pain and promote healing.
• Oral medications: In severe cases, your doctor may prescribe oral medications such as steroids (e.g., prednisone) to reduce inflammation.
• Cautery of sores: In some cases, doctors may use chemical cautery (such as silver nitrate) to treat canker sores, which can speed up healing.
• Nutritional supplements: If your canker sores are caused by nutritional deficiencies, your doctor may recommend supplements for vitamin B-12, zinc, folate, or iron.

Home Remedies and Self-Care

• Rinse your mouth:
  • Use salt water or baking soda rinse (dissolve 1 teaspoon of salt or baking soda in 1/2 cup of warm water).
  • Rinse with a mixture of 1 part hydrogen peroxide and 1 part water (do not swallow).
  • Use an antimicrobial mouthwash to reduce bacteria.
• Apply over-the-counter products:
  • Use topical anesthetics like benzocaine (Anbesol, Orajel) to numb the area temporarily.
  • Apply a thin paste of baking soda and water directly to the sore.
• Avoid irritants:
  • Stay away from acidic or spicy foods that can irritate the sore.
  • Avoid abrasive foods like chips, nuts, or toast that can scratch the sore.
  • Use a soft-bristled toothbrush and avoid toothpastes containing sodium lauryl sulfate.
• Pain relief:
  • Take over-the-counter pain relievers like ibuprofen or acetaminophen if needed.
  • Apply ice to the sore to reduce pain and inflammation.
• Dietary adjustments:
  • Eat a balanced diet rich in vitamins and minerals.
  • Consider taking a daily multivitamin if you suspect nutritional deficiencies.

Sources: Healthline, WebMD

Prevention Tips

While there is no guaranteed way to prevent canker sores, you can reduce your risk and frequency of outbreaks by following these tips:

• Practice good oral hygiene:
  • Brush your teeth gently with a soft-bristled brush after meals and floss daily.
  • Use mild toothpaste without sodium lauryl sulfate.
  • Visit your dentist regularly for check-ups and cleanings.
• Avoid trigger foods:
  • Identify and avoid foods that irritate your mouth, such as acidic or spicy foods.
  • Be cautious with hard or crunchy foods that can cause minor mouth injuries.
• Manage stress:
  • Practice stress-reducing techniques such as meditation, yoga, or deep breathing exercises.
  • Ensure you get adequate sleep and maintain a healthy work-life balance.
• Maintain a balanced diet:
  • Eat a variety of fruits, vegetables, whole grains, and lean proteins.
  • Ensure you are getting enough vitamins and minerals, particularly vitamin B-12, zinc, folate, and iron.
• Protect your mouth:
  • Use a mouthguard if you grind your teeth at night or play contact sports.
  • Be cautious when eating or drinking hot foods and beverages to avoid burns.
• Stay hydrated:
  • Drink plenty of water throughout the day to keep your mouth moist.
  • Avoid excessive alcohol and caffeine, which can dehydrate you.
• Monitor your health:
  • Keep track of your canker sore outbreaks and identify any patterns or triggers.
  • Consult your doctor if you suspect an underlying health condition.

Source: Medical News Today

By understanding the causes, symptoms, and treatment options for canker sores, you can manage outbreaks effectively and reduce their impact on your daily life. Always consult a healthcare provider if you have concerns or if your symptoms worsen.