What causes ulcers in throat

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Last updated: April 4, 2026

Quick Answer: Throat ulcers, also known as mouth ulcers or canker sores, are typically caused by minor injuries to the soft tissues of the mouth, certain foods, stress, or underlying medical conditions. Viral infections, such as herpes simplex virus, are also a common culprit, leading to painful sores that can appear on the throat lining.

Key Facts

What Causes Ulcers in the Throat?

Throat ulcers, often referred to as canker sores or aphthous ulcers when they occur in the mouth and extend to the throat, are painful sores that can make eating, drinking, and speaking difficult. While the exact cause of every throat ulcer isn't always clear, a combination of factors can contribute to their development. These sores are not contagious and are distinct from cold sores, which are caused by a virus and appear on the outside of the mouth.

Common Causes and Contributing Factors

Minor Injuries and Trauma

One of the most frequent causes of throat ulcers is minor trauma to the delicate lining of the mouth and throat. This can happen in several ways:

Dietary Triggers

Certain foods are known to trigger or worsen throat ulcers in some individuals:

Stress and Emotional Factors

There is a strong link between stress and the development of canker sores. Emotional stress can weaken the immune system, making the body more susceptible to developing ulcers. Many people report outbreaks during periods of intense pressure, anxiety, or lack of sleep.

Nutritional Deficiencies

A lack of certain vitamins and minerals can also play a role in the formation of throat ulcers:

If you suspect a nutritional deficiency, it's important to consult a healthcare professional for diagnosis and appropriate supplementation.

Hormonal Changes

Some women experience an increase in canker sores during certain phases of their menstrual cycle due to hormonal fluctuations. Pregnancy can also be a factor for some.

Immune System Issues

An overactive or compromised immune system can contribute to ulcer formation. Conditions that affect the immune system, such as:

Viral Infections

While canker sores themselves are not contagious, other types of throat ulcers can be caused by viral infections. The most common viral cause of painful sores in the throat is the herpes simplex virus (HSV), which causes cold sores. However, these are typically located on the lips or around the mouth, but in some cases, the virus can spread to the throat, causing herpetic pharyngitis or tonsillitis, which can present as painful ulcers.

Other Potential Causes

When to Seek Medical Advice

Most throat ulcers are minor and resolve on their own within a week or two. However, you should consult a doctor or dentist if:

A healthcare professional can help determine the underlying cause of your throat ulcers and recommend the most appropriate treatment, which may include topical anesthetics, corticosteroid rinses, or addressing any underlying medical conditions.

Sources

  1. Aphthous ulcer - WikipediaCC-BY-SA-4.0
  2. Mouth ulcer - NHSfair-use
  3. Canker sores - Symptoms and causes - Mayo Clinicfair-use

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