Ulcers on the tongue usually come from irritation or injury, but they can also signal underlying health issues.

Main causes of tongue ulcers

  • Minor injury to the tongue – Biting your tongue, burns from very hot food or drinks, sharp or broken teeth, rough fillings, braces, retainers, or poorly fitting dentures can all damage the surface and trigger an ulcer.
  • Friction and harsh products – Hard-bristled toothbrushes, very vigorous brushing, or irritating/abrasive toothpastes and mouthwashes (for example, those with strong foaming agents) can contribute.
  • Acidic or spicy foods – Citrus fruits, tomatoes, pineapples, very spicy meals, chocolate, coffee, and similar foods can irritate the tongue lining or trigger ulcers in sensitive people.
  • Stress, fatigue, and hormones – Emotional stress, lack of sleep, feeling run down, and hormonal changes (such as during periods or pregnancy) are well-known triggers that make ulcers more likely to appear or recur.
  • Stopping smoking – Some people develop mouth and tongue ulcers shortly after they quit smoking as the mouth lining adjusts.
  • Medications – Certain drugs, including some nonsteroidal anti-inflammatory drugs (NSAIDs), beta blockers, and a few heart or ulcer medicines (like nicorandil), can cause or worsen mouth ulcers in some individuals.
  • Food allergies or intolerances – Reactions to particular foods (for example, gluten, nuts, or other triggers) can show up as recurrent ulcers in the mouth, including on the tongue.

Underlying health conditions

Sometimes tongue ulcers are part of a bigger health problem rather than a simple one-off sore.

  • Vitamin and mineral deficiencies – Low levels of iron, folate, zinc, vitamin B group, or vitamin D can make you more prone to repeated ulcers.
  • Digestive and autoimmune diseases – Conditions like Crohn’s disease, celiac disease, Behçet’s disease, and lupus can cause recurrent tongue and mouth ulcers as part of their symptom picture.
  • Infections and immune problems – Viral infections (such as hand, foot and mouth disease or herpes), some bacterial or fungal infections, and immune system problems (including HIV or other causes of weakened immunity) can all present with ulcers on the tongue.
  • Oral lichen planus and other mouth conditions – Some chronic inflammatory conditions of the mouth cause white patches plus painful ulcers on the tongue and cheeks.
  • Cancer (less common but important) – A sore or ulcer on the tongue that does not heal within about 2–3 weeks, especially if it’s hard, irregular, or associated with a lump, unexplained bleeding, or numbness, needs urgent medical or dental review to rule out oral cancer.

When to see a doctor or dentist

  • The ulcer lasts longer than 2–3 weeks or keeps coming back.
  • You have many ulcers at once, or they are very large or extremely painful.
  • You also have fever, rash, weight loss, tummy problems, or feel generally unwell.
  • There is a lump, hard area, or unexplained bleeding on the tongue or in the mouth.

They can examine your mouth, check for triggers (teeth, braces, products, foods), and, if needed, order blood tests or refer you to a specialist to look for deficiencies or underlying disease.

Mini FAQ style “Quick Scoop”

  • Is it always serious?
    No. Many tongue ulcers come from simple trauma, hot food, or stress and heal on their own in 1–2 weeks.
  • What can I do at home?
    Avoid hot, spicy, or acidic foods; switch to a softer toothbrush and non- irritating toothpaste; and consider stress management and better sleep while the ulcer heals.
  • Could it be a sign of a deficiency or illness?
    Yes. Recurrent or severe ulcers can be linked to vitamin deficiencies, gut diseases, autoimmune conditions, or infections, which is why persistent sores should be checked.

Information gathered from public forums or data available on the internet and portrayed here.