What causes ulcers in throat
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Last updated: April 4, 2026
Key Facts
- About 20% of people experience recurrent mouth ulcers.
- Ulcers typically heal within 7-14 days without treatment.
- Certain acidic or spicy foods can aggravate existing ulcers.
- Stress is a common trigger for ulcer outbreaks in susceptible individuals.
- Viral infections, particularly herpes simplex, are a frequent cause of throat sores.
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:
- Accidental Biting: Biting your tongue, cheek, or the inside of your lip can create a small wound that may develop into an ulcer. Similarly, accidentally biting the back of your throat can lead to a sore.
- Dental Work: Dental procedures, such as fillings, crowns, or braces, can sometimes cause irritation or minor injuries to the oral tissues, potentially leading to ulcer formation.
- Rough Tooth Surfaces: A sharp edge on a tooth or a poorly fitting dental appliance can also cause repeated friction and irritation.
- Hard Brushing: Aggressive tooth brushing can sometimes damage the soft tissues.
Dietary Triggers
Certain foods are known to trigger or worsen throat ulcers in some individuals:
- Acidic Foods: Citrus fruits (oranges, lemons, grapefruit), tomatoes, and pineapples contain acids that can irritate the oral lining.
- Spicy Foods: Peppers, chilies, and other spicy ingredients can cause significant discomfort and inflammation.
- Certain Nuts and Chocolates: Some people report that these foods can trigger outbreaks.
- Gluten Sensitivity: While not a direct cause for everyone, individuals with celiac disease or non-celiac gluten sensitivity may experience oral ulcers as a symptom.
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:
- Vitamin B12 Deficiency: This is a common deficiency linked to recurrent ulcers.
- Iron Deficiency: Low iron levels can also contribute.
- Folic Acid Deficiency: This B vitamin is essential for cell health.
- Zinc Deficiency: Zinc is important for immune function and wound healing.
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:
- Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease and ulcerative colitis are associated with a higher incidence of oral ulcers.
- Behçet's Disease: This rare disorder causes inflammation in blood vessels throughout the body and frequently leads to painful sores in the mouth and throat.
- Weakened Immune System: Conditions that weaken the immune system, such as HIV/AIDS or those undergoing chemotherapy or radiation therapy, can increase susceptibility to various oral infections and sores.
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
- Allergies: Reactions to certain foods or environmental allergens can sometimes manifest as oral sores.
- Certain Medications: Some drugs, including non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, and beta-blockers, have been associated with ulcer formation in some individuals.
- Gastroesophageal Reflux Disease (GERD): Stomach acid backing up into the esophagus and throat can cause irritation and potentially lead to sores.
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:
- The ulcers are unusually large or numerous.
- They are extremely painful and interfere significantly with eating or drinking.
- They recur frequently.
- They do not heal within two weeks.
- You have a high fever or feel generally unwell.
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.
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Sources
- Aphthous ulcer - WikipediaCC-BY-SA-4.0
- Mouth ulcer - NHSfair-use
- Canker sores - Symptoms and causes - Mayo Clinicfair-use
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