How long can a mouth ulcer last?

Its been with me for weeks, im woundering if I have a virus or something.

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Answer:
The most common type of mouth ulcers are called 'apthous' ulcers. They are probably viral. (though no virus has been identified.)This means they should not be given antibiotics as there have no effect. There behaviour is similar to cold sores, in that they are recurrent, come out when we are run down and we never seem to develop immunity. Here the similarity ends, because unlike herpetic cold sores there’s no treatment.

Each ulcer lasts about 10 days, but you can get further crops erupting, so each episode may last longer than that.

Ice,ice cream and cold soft items, become the easiest things to eat. Teething gels sometimes help. There are 2 prescription drugs for apthous ulcers, Corlan Pellets and Adcortyl in Orobase paste. Both are steroids, only reduce the nipping a bit and neither hastens resolution.

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Answer:
i used to get mouth ulcers, there was a program on tv witch done a survey on toothpaste it found some had these cleaning agents in like you use to clean ovens, and since i changed my toothpaste i haven’t had mouth ulcers, i now use colgate total

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Answer:
Well it can last for ages.. you need to treat it though, i've had 2 for 2 weeks, but they go a lot quicker with bonjella?

They wont go away by themselves

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Answer:
you probably have a stomach ulcer which causes them to go into your mouth, if its really painful then go see a chinese physician

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Answer:
You might, ive only ever known mine to last 2-4 days

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Answer:
have you tried putting salt on it.? Even though if it still no superior in a couple of days perhaps go to your GP.