Oral Lichen Planus: Symptoms, Causes, and Treatment in the UK

Oral lichen planus is a long-term (chronic) inflammatory condition that affects the mucous membranes inside your mouth. Unlike a simple mouth ulcer or a temporary infection like oral thrush, oral lichen planus is an ongoing issue driven by the immune system. In the UK, it is estimated to affect approximately 1% to 2% of the population, more commonly appearing in adults over the age of 40.

The condition occurs when the body's immune system attacks the cells of the oral mucous membranes for reasons that are not yet fully understood. It is important to note that oral lichen planus is not an infection, it is not caught from someone else, and it is not a result of poor oral hygiene. According to NHS guidance, it is often a standalone condition, though it can sometimes be associated with lichen planus affecting the skin or other areas of the body.

Symptoms of oral lichen planus can vary significantly between individuals. Some people may have no discomfort at all, while others experience significant pain that makes eating and drinking difficult. The presentation usually falls into three categories:

• Reticular: This is the most common form, characterised by a white, lace-like pattern of lines known as 'Wickham striae'. These usually appear on the inside of the cheeks or the sides of the tongue.
• Erosive (Ulcerative): This involves painful, red, and raw areas where the surface layer of the mouth lining has broken down. These ulcers can be persistent and very sore.
• Atrophic: This appears as red patches where the lining of the mouth has become thin. It often causes a burning sensation, especially when eating spicy or acidic foods.

Other symptoms include swollen gums (desquamative gingivitis), sensitivity to hot or cold temperatures, and a metallic taste in the mouth. If you notice persistent white patches or recurring sores, it is advisable to seek a professional opinion from a UK online doctor or your local dentist.

The exact cause remains unknown, but it is widely accepted as an autoimmune process where T-cells (a type of white blood cell) mistakenly attack the lining of the mouth. While the primary trigger is often elusive, several factors are known to exacerbate the condition or cause 'lichenoid reactions' that mimic it:

• Medications: Certain drugs for high blood pressure, heart disease, and diabetes can trigger a reaction in the mouth.
• Dental Materials: In rare cases, an allergy to mercury in amalgam fillings can cause a localized lichenoid reaction.
• Injury: Sharp teeth, poorly fitting dentures, or biting your cheek can trigger a flare-up in a specific area (known as the Koebner phenomenon).
• Stress: Many UK patients report that their symptoms worsen during periods of high emotional stress or anxiety.

NICE (National Institute for Health and Care Excellence) guidelines suggest that while the condition is chronic, managing these triggers can significantly improve a patient's quality of life.

Currently, there is no permanent cure for oral lichen planus, but symptoms can be managed effectively so that they do not interfere with daily life. If your condition is not causing pain, treatment might not be necessary beyond regular monitoring.

For symptomatic cases, the following treatments are commonly used in the UK:

Topical Corticosteroids

These are the mainstay of treatment. They come in the form of mouthwashes, sprays, or pastes (such as hydrocortisone oromucosal buccal tablets). These work by reducing the inflammation and dampening the immune response in the local area.

Antiseptic Mouthwashes

Mouthwashes containing chlorhexidine may be recommended to keep the mouth clean and prevent secondary infections, especially when open ulcers are present.

Lifestyle Adjustments

Patients are often advised to avoid 'trigger' foods. This usually includes spicy foods, acidic fruits (like lemons or tomatoes), and very salty snacks. Switching to a 'SLS-free' (Sodium Lauryl Sulfate) toothpaste can also reduce irritation for those with sensitive mouth linings.

Managing chronic mouth conditions can be frustrating, especially if you are unsure of the diagnosis. You should consider booking a consultation to speak to a GP online in the UK if you experience any of the following:

• You have white patches in your mouth that have lasted longer than two weeks.
• You have painful mouth ulcers that keep returning or do not heal.
• Eating and drinking have become painful due to mouth sensitivity.
• You are worried about the appearance of your tongue or gums.

An online doctor can review your symptoms, provide advice on pain relief, and determine if an in-person specialist referral to an oral surgeon or dermatologist is required. They can also provide a private sick note if severe flare-ups are impacting your ability to work.

Most people with oral lichen planus lead normal lives. However, because it is a chronic condition, long-term monitoring is required. A very small percentage of patients (roughly 1%) with the erosive form of the condition may develop oral cancer over many years. For this reason, it is vital to have a dental check-up at least once every six months so that any changes can be caught early.

Stopping smoking and reducing alcohol consumption are the most important steps you can take to lower this risk, as both smoking and alcohol can further irritate the mouth lining and increase the likelihood of malignant changes.