Get your Health question answered in 3 easy steps
A Doctor will be with you shortly
Ask a Doctor Now
170 Doctors are Online

What causes canker sores?

User rating for this question
Answered by

Infectious Diseases Specialist
Practicing since : 2002
Answered : 877 Questions
What causes canker sores? They seem to pop up instantly. Are they contagious?
Posted Sat, 9 Aug 2014 in Skin Hair and Nails
Answered by Dr. Roopa Hiremath 1 hour later
Brief Answer:
Not contagious, will heal in few days

Detailed Answer:
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.


Above answer was peer-reviewed by
Share on Facebook
Share on Twitter
Share on Google+

The user accepted the expert's answer

Ask a Dermatologist

© Ebix, Inc. All Rights Reserved.
All the information, content and live chat provided on the site is intended to be for informational purposes only, and not a substitute for professional or medical advice. You should always speak with your doctor before you follow anything that you read on this website. Any health question asked on this site will be visible to the people who browse this site. Hence, the user assumes the responsibility not to divulge any personally identifiable information in the question. Use of this site is subject to our Terms & Conditions
Already Rated.
Your rating:

Ask a Doctor