Should I worry about canker sores?
Sarah Scott
Updated on June 04, 2026
Canker sores are fairly common, but that doesn't mean they should be ignored. If you have sores that last longer than 2 weeks or you can't eat or drink because of the pain, call your doctor. Also call if you get the sores more than two or three times a year. Usually, no tests are needed to diagnose canker sores.
Should I be worried if I have canker sores?
Most canker sores go away on their own in a week or two. Check with your doctor or dentist if you have unusually large or painful canker sores or canker sores that don't seem to heal.What happens if you don't treat a canker sore?
Canker sores aren't contagious . They usually heal within 1 to 3 weeks without treatment, although the pain normally goes away in 7 to 10 days. Serious canker sores may take up to 6 weeks to heal.When should I go to the doctor for a canker sore?
Consult your doctor if your canker sore is unusually large and lasts longer than two weeks. If you can't control the pain and find it especially difficult to eat, there are medicines your doctor can prescribe to help that are not over-the-counter.Are canker sores caused by a virus?
Unlike cold sores, canker sores don't occur on the external surface of your lips (outside the mouth). "Even though canker sores and cold sores can have the same triggers, canker sores are not contagious," says Dr. Varinthrej Pitis. "There is no virus or bacteria associated with them.How Do You Get Rid of a Canker Sore?
Why do I suddenly have canker sores?
Canker sores are an autoimmune response of the body that damages the skin inside the mouth after a local injury. They might be triggered by poor diet, local injury, food allergies, spicy food and vitamin deficiencies. Rarely, a virus may cause canker sores.Can canker sores be a symptom of something else?
Canker sores are small ulcers that form in the mouth and cause pain, tenderness, or discomfort. So what are canker sores a symptom of? Although most canker sores are harmless, they can be a sign of a more serious medical condition such as celiac disease, Crohn's disease, or Behcet's disease.How long do cankers last?
Canker sores may hurt for 7 to 10 days. Minor canker sores heal completely in 1 to 3 weeks, but major canker sores can take up to 6 weeks to heal. Some people get another canker sore after the first sore has healed. Most canker sores heal without a scar.What is the white part of a canker sore?
These tiny swellings contain a mixture of WBCs (white blood cells) and bacteria, and some other fluids and look like white-yellowish cysts with a red border. Anyone with canker sores can feel embarrassed, especially if they are dating, and might think of bursting them.What color is a canker sore when healing?
Canker sore appearance during its healing stages.As this epithelialization process takes place, the original yellow-white color of the sore will take on a grey-white appearance.
Does salt really help canker sores?
When having mouth sores such as canker or cold sore, you can alleviate the associated pain and discomfort by rinsing your mouth with salt water. Salt is one of the oldest and effective methods to get rid of oral problems. It can assist in minimizing the size and ache of a canker sore in just 24 hours.How do you know if a canker sore is serious?
Seven symptoms to look out for
- Nagging mouth pain.
- Bleeding sore in the mouth that won't heal and lasts for more than two weeks.
- Swelling in the neck that lasts for more than two weeks.
- An area in your mouth that becomes discolored and stays that way.
- A lump or thickening in your cheek that doesn't go away.
How can you tell if a canker sore is cancerous?
Distinguishing a Canker Sore From Oral CancerWhereas a canker sore is usually painful, oral cancer may or may not cause pain. Canker sores are always flat and usually have a white or yellow center (and turn gray as they're healing). Oral cancer lesions can be flat or raised and are often white or red.