What Causes Blisters Under the Tongue?

Blisters under the tongue can have various causes, and determining the specific reason may require a healthcare professional’s evaluation. Here are some potential causes:

  • Canker Sores (Aphthous Ulcers): These are shallow, painful sores that can develop on the soft tissues inside the mouth, including under the tongue. The exact cause of canker sores is not well understood, but factors such as stress, hormonal changes, and certain foods may contribute.
  • Oral Herpes (Cold Sores): While oral herpes typically causes sores on the lips, it can also involve other areas inside the mouth, including under the tongue. Herpes simplex virus (HSV) is responsible for cold sores, and the sores can recur during periods of stress or illness.
  • Trauma or Injury: Accidental biting, irritation from sharp foods, or other forms of trauma to the soft tissues under the tongue can lead to the formation of blisters.
  • Infections: Bacterial, viral, or fungal infections can cause blisters or sores under the tongue. Infections may result from poor oral hygiene, a weakened immune system, or exposure to pathogens.
  • Hand, Foot, and Mouth Disease: This viral infection, commonly seen in children, can cause painful sores or blisters in the mouth, including under the tongue.
  • Autoimmune Conditions: Certain autoimmune disorders, such as pemphigus or pemphigoid, can lead to blistering in the mouth.
  • Nutritional Deficiencies: Deficiencies in certain vitamins and minerals, such as vitamin B12, iron, or folic acid, may contribute to the development of oral sores, including those under the tongue.

If you have persistent or recurrent blisters under your tongue, it’s advisable to seek medical attention. A healthcare professional, such as a dentist or oral health specialist, can examine the area, take a detailed medical history, and may perform tests if needed to determine the underlying cause. Treatment will depend on the specific diagnosis, and it may involve addressing the root cause, managing symptoms, or using medications to promote healing.