Mouth Ulcer
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Reviewed By:
Yoshinori Abe, MD (Internal medicine)
Dr. Abe graduated from The University of Tokyo School of Medicine in 2015. He completed his residency at the Tokyo Metropolitan Health and Longevity Medical Center. He co-founded Ubie, Inc. in May 2017, where he currently serves as CEO & product owner at Ubie. Since December 2019, he has been a member of the Special Committee for Activation of Research in Emergency AI of the Japanese Association for Acute Medicine. | | Dr. Abe has been elected in the 2020 Forbes 30 Under 30 Asia Healthcare & Science category.
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Ulcers in the mouth but they don't hurt
Sores in the mouth but they don't hurt
Oral ulceration
Painless mouth erosion
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Content updated on Jan 4, 2023
About the symptom
An oral ulcer is a sore that develops in the soft tissue lining of the gums, tongue, inner cheeks, lips or palate.
When to see a doctor
Seek professional care if you experience any of the following symptoms
Disorder of consciousness
Altered mental status (delirium)
Visual field defect
Seizure attack
Impossible to walk normally
Repeated fever above 38 ℃
Head injury
Fainting with loss of consciousness
Involuntary movements
Possible causes
Viral mucositis
- Candidiasis (oral, hands and feet)
Normal human skin contains bacteria and fungi. Candidiasis happens when the fungus overgrows and invades the skin. Risk factors include warm moist environments, and a weakened immune system.
- Stomatitis
Inflammation of the mouth surface produces ulcers. The causes are varied, including vitamin deficiencies, medications, and autoimmunity (body's own immune system attacking itself). Often, no clear cause is found and the ulcers heal by themselves.
- Behcet's disease
- Systemic lupus erythematosus (SLE)
- Crohn's disease
Related serious diseases
- Epilepsy
Epilepsy is a neurological disorder where brain activity becomes abnormal. This can cause seizures of varying lengths of time and severity. Epilepsy can affect people of any age and may occur due to genetic disorders or brain injury such as stroke.
- Acute HIV infection
- Chronic subdural hematoma
Questions your doctor may ask about this symptom
Your doctor may ask these questions to check for this symptom
Do you have sores or erosions in your mouth?
Do you have itchy skin?
Do you have any pain or tingling in the affected areas of the skin?
Do you have skin redness?
Do you have a fever?
Other Related Symptoms
Similar symptoms or complaints
Symptoms from the same body system / part
Symptoms treated by the same specialty
Reviewed By:
Yoshinori Abe, MD (Internal medicine)
Dr. Abe graduated from The University of Tokyo School of Medicine in 2015. He completed his residency at the Tokyo Metropolitan Health and Longevity Medical Center. He co-founded Ubie, Inc. in May 2017, where he currently serves as CEO & product owner at Ubie. Since December 2019, he has been a member of the Special Committee for Activation of Research in Emergency AI of the Japanese Association for Acute Medicine. | | Dr. Abe has been elected in the 2020 Forbes 30 Under 30 Asia Healthcare & Science category.
Just 3 minutes.
Developed by doctors.
Ubie is supervised by 50+ medical experts worldwide
Seiji Kanazawa, MD, PHD
Obstetrics and gynecology (OBGYN)
National Center for Child Health and Development, Japan