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What Causes Canker Sores?

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Posted on Sat, 9 Aug 2014
Question: What causes canker sores? They seem to pop up instantly. Are they contagious?
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Answered by Dr. Roopa Hiremath (1 hour later)
Brief Answer:
Not contagious, will heal in few days

Detailed Answer:
Hi XXXX
Welcome to health care magic.

Canker sores are small, superficial ulcers that appear in the mouth and make eating spicy foods uncomfortable.

These are most commonly caused by:
Stress or tissue injury
Certain foods including citrus fruits and vegetables (such as lemons, oranges, pineapples, apples, figs, tomatoes, and strawberries)
Sharp tooth surfaces like broken teeth
Ill-fitting dentures

They are commonly confused with cold sores which are caused by a virus herpes simplex.

These cold sores are highly contagious and usually occur on margins of lips and below nose.

I suggest you get a prescription for vitamin B complex capsules to be taken twice daily for a week.

You can get an over the counter anesthetic gel like Dentogel to apply over the canker sore 3-4 times daily.

These canker sores will heal by themselves within a week to 10 days.

Few tips to avoid recurrence of these sores:
Avoiding foods that irritate your mouth like citrus fruits and spicy foods.
Brush with a soft-bristled brush and floss daily.
Avoid ill fitting dentures.

I hope I have helped you with this answer.

Please let me know if I can assist you further.

Thanks.

Note: Hope the answers resolves your concerns, however for further guidance of skin related queries consult our Dermatologist.Click here to book a consultation

Above answer was peer-reviewed by : Dr. Bhagyalaxmi Nalaparaju
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Answered by
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Dr. Roopa Hiremath

Infectious Diseases Specialist

Practicing since :2002

Answered : 877 Questions

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What Causes Canker Sores?

Brief Answer: Not contagious, will heal in few days Detailed Answer: Hi XXXX Welcome to health care magic. Canker sores are small, superficial ulcers that appear in the mouth and make eating spicy foods uncomfortable. These are most commonly caused by: Stress or tissue injury Certain foods including citrus fruits and vegetables (such as lemons, oranges, pineapples, apples, figs, tomatoes, and strawberries) Sharp tooth surfaces like broken teeth Ill-fitting dentures They are commonly confused with cold sores which are caused by a virus herpes simplex. These cold sores are highly contagious and usually occur on margins of lips and below nose. I suggest you get a prescription for vitamin B complex capsules to be taken twice daily for a week. You can get an over the counter anesthetic gel like Dentogel to apply over the canker sore 3-4 times daily. These canker sores will heal by themselves within a week to 10 days. Few tips to avoid recurrence of these sores: Avoiding foods that irritate your mouth like citrus fruits and spicy foods. Brush with a soft-bristled brush and floss daily. Avoid ill fitting dentures. I hope I have helped you with this answer. Please let me know if I can assist you further. Thanks.