Cracked corners of the mouth – causes and foods with B vitamins

Cracks at the corners of the mouth may seem like a minor issue, but anyone who has experienced them knows how uncomfortable they can be. They can sting when you eat acidic foods, hurt when you yawn, and often turn into a recurring problem that never seems to heal completely. In many cases, there is a simple explanation, but sometimes cracked corners of the mouth can be a sign that your body is lacking important nutrients or needs extra care.

Cracked corners of the mouth? 8 recipes rich in B vitamins

What are cracked corners of the mouth and why do they occur?

Cracked corners of the mouth are medically known as angular cheilitis. It is an inflammatory condition affecting the skin and mucous membranes at the corners of the mouth, and it can cause redness, cracking, crusting, tenderness, and sometimes a whitish maceration of the skin. The condition occurs exactly where the upper and lower lips meet, making this area especially vulnerable to moisture, friction, and irritation.

A common cause is the accumulation of saliva in the corners of the mouth. This softens the skin and makes it more sensitive, particularly in people who frequently lick their lips, breathe through their mouth, or experience dryness that leads to constant moisturising of the area. Over time, small cracks can develop, allowing yeast such as Candidaor bacteria such as Staphylococcus to more easily take hold.

In some individuals, the cause is structural rather than infectious. Poorly fitting dentures, worn teeth, or a bite that causes the corners of the mouth to droop can create skin folds where saliva tends to collect and remain.

Cracked corners of the mouth and vitamin deficiency – when do B vitamins play a role?

When cracked corners of the mouth return, or at the same time as fatigue, paleness, a sore tongue or other oral mucosal problems, you need to think more broadly. Iron deficiency and a deficiency of certain B vitamins are classic underlying causes, especially riboflavin (vitamin B2) and vitamin B12. folate, which also belongs to the B vitamins, may also be relevant if the problems are part of a larger picture of anemia or nutritional deficiency.

Riboflavin deficiency can cause changes in the corners of the mouth, cracked lips, sore mouth, glossitis and sometimes skin problems. Glossitis means inflammation of the tongue and can be noticed as a smooth, red and tender tongue. Riboflavin deficiency is uncommon as an isolated deficiency in the Western world, but can occur with a one-sided diet, malabsorption or at the same time as other nutritional deficiencies.

Vitamin B12 deficiency and folate deficiency mainly cause problems by affecting blood formation and cell regeneration. The oral mucosa is one of the body's most rapidly renewing tissues, and therefore it can react early when something is missing. In those who eat a completely plant-based diet without B12 supplements, have intestinal disease, long-term treatment with stomach acid inhibitors or reduced absorption with increasing age, B12 deficiency is particularly important to rule out.

This does not mean that all cracked corners of the mouth are due to vitamin deficiency. On the contrary, local irritation and infection are often more common. However, if the problem becomes long-lasting, recurs or is combined with other symptoms, testing is more reasonable than just smearing and hoping.

Other common causes that many people miss

A fungal infection in or around the mouth can also contribute, particularly in people with diabetes, a weakened immune system, recent antibiotic treatment, or the use of inhaled corticosteroids. Using a steroid inhaler without rinsing the mouth afterwards increases the risk of local fungal overgrowth.

Skin conditions may likewise play a role. Eczema, contact allergies to products such as toothpaste, lip care products, or oral hygiene products, as well as generally dry skin, can all lead to similar symptoms. In some cases, the corners of the mouth are simply where the irritation becomes most visible.

In children, common triggers include drooling, pacifier use, and frequent lip licking. In adults, angular cheilitis is often associated with dentures, dental health issues, smoking, or dry mouth. From an occupational health perspective, it is a useful example of how seemingly minor symptoms can sometimes reflect broader underlying conditions such as nutritional deficiencies, diabetes, or medication side effects.

Medical attention should be sought if the cracks do not heal within a couple of weeks, if they are severe or painful, if the rash spreads, or if there are accompanying warning signs such as fatigue, unexplained weight loss, recurrent infections, or other systemic symptoms. In such cases, a more thorough medical evaluation is needed. The goal is not only to relieve symptoms, but also to identify and address the underlying cause.

Foods containing B vitamins – 8 recipes to try

If the diet is one-sided, food can be part of the solution. B vitamins are found in several different foods, but different vitamins have different sources. Riboflavin is found in dairy products, eggs and fortified cereals, folate is abundant in dark green leafy vegetables, beans, peas, nuts and fruit, while vitamin B12 is naturally found mainly in animal foods and in some fortified products.

Here are eight recipe ideas that make it easier to get several B vitamins in regular food:

• Omelette with spinach and mushrooms
  Eggs contribute riboflavin and B12, while spinach adds folate. A good breakfast or quick lunch for those who want to eat soft and gentle when the corners of their mouths are burning.

• Lentil stew with tomato, carrot and kale
  Lentils and kale are rich in folate and go well in a dish that can be cooked in large batches. For vegetarians, this is a good base, but it does not cover the B12 requirement without fortified products or supplements.

• Baked salmon with potatoes and broccoli
  Fish provides B12, and broccoli contains folate. The dish is easy to adapt for families and also works well in a lunchbox for work.

• Yogurt bowl with fortified muesli, pumpkin seeds and berries
  Dairy products provide riboflavin and B12, and fortified cereal products can provide several B vitamins. A practical alternative when your appetite is low but you still want to get some nutrition.

• Bean salad with chickpeas, avocado and orange
  Beans and chickpeas provide folate, and citrus fruit can make the meal more varied. However, if the corners of the mouth are very irritated, you may need to avoid acidic ingredients until the skin has healed.

• Liver pâté sandwich with eggs and wholemeal bread
  Liver and eggs are classic sources of several B vitamins, including B12 and riboflavin. For many, this is an easy way to improve your nutritional intake without changing your entire diet.

• Wok with tofu, edamame and pak choi
  Green vegetables and legumes contribute folate. If you eat vegan, you can combine the dish with fortified plant drinks or other B12-fortified foods, as natural plant sources of B12 are limited.

• Oatmeal porridge with milk or fortified plant drinks, banana and almonds
  A simple everyday dish that can provide riboflavin via milk and sometimes extra B vitamins via fortified products. For shift workers, the elderly and people with irregular eating habits, such standard meals are often more realistic than advanced diet plans.

There is an important practical difference here: food can improve a low intake, but it does not always solve an absorption problem. If you have a B12 deficiency due to impaired absorption, simply eating more B12-rich foods is often not enough. In this case, the treatment needs to be adapted to the cause.

When should you test your values?

If you often get cracked corners of the mouth, especially together with fatigue, pale skin, palpitations, numbness, a sore tongue or recurring mouth ulcers, it is reasonable to check your blood values ​​and nutritional status. This often includes blood counts, ferritin for iron stores and sometimes vitamin B12 and folate depending on the symptom picture. Which tests are most relevant depends on age, diet, medications and other diseases.

Cracked corners of the mouth are therefore not just a skin problem. They sit at the interface between skin, oral health, nutrition and general medicine, and that is precisely why they can provide valuable information about how the body is doing overall.