Frequent reccurring canker sore on the inside of the lip... it appears 3-4 time per month and last max 3-4 days... should i be worried ?

See below: Generally not life-threatening. It could be due to many issues from nutritional choices, to immune system issues, to genetics. See you doc for an eval.

Concerned: Most canker sores or apthous ulcers appear for 7-10 days with symptoms. They can be set off by various triggers. They are of an autoimmune source, not infectious. Your frequency of occurrence is more than normal unless you are continuously setting them off. However, there are a number of other causes of oral lesions, like lichen planis, that exhibit as sores. Go see your dentist for evaluation.

Mouth sores: You might need to have it checked out to rule out some infectious etiologies or autoimmune diseases.

See your dentist: The frequency sounds abnormally high. The duration sounds pretty short. Canker sores are bacterial in nature and are typically caused by trauma. Remove the trauma and see if the problem goes away. See if you have a sharp tooth that may be irritating that area. Your dentist can help you.

Other causes: I would see your dentist to see if there is a dental cause for these recurring. If there is not i would see your physician for an evaluation.

That's not typical : For a true canker sore (aphthous ulcer) and may not be what you think it is. I would start by seeing your own dentist for a clinical evaluation when you actually have one of the sores present.

Heal in a week: Canker sores. Small ulcers with a white or gray base and a red border, canker sores appear inside the mouth. They are not contagious, but can return frequently and may be only one canker sore or several. Their exact cause is uncertain but some experts believe that immune system problems, bacteria or viruses may be involved. Canker sores usually heal on their own after a week or two. Over-the-count.

No worries: You should not be worried. Canker sores can occur anytime. But they usually occur when one is under a lot of stress.

No: Generally not something to worry about. If the sores are recurring you may be immunocompromised or have vitamin deficiencies. Speak to your dentist or md for options to reduce the pain associated. Also consider a sls free toothpaste.

Concerned: Not worry, but you may have recurrent apthous ulcers. Look it up on the internet, for there are many different treatment ideas and you may find one that works well for you.

Reduce stress...: By exercising, not too much or too little, eating well, and sleeping well.

Good dental hygiene: There is suspicion that the canker sores may be related to a bacterium in the mouth called s mutans. Thus good dental hygiene (flossing, brushing, cleaning) may help reduce the frequency. However the cause for canker sores remains obscure.