Why does eating pineapple cause mouth corner sores?

Generally, cracked corners of the mouth refer to fissures at the corners of the lips. Cracked mouth corners after eating pineapple may be caused by physical injury, vitamin deficiency, malnutrition, allergic reactions, angular cheilitis, or other reasons. If the above conditions occur, it is recommended to seek medical treatment promptly. Specific analyses are as follows:

1. Physical Injury

When eating pineapple, if the pineapple slices are too sharp or improperly consumed, they may irritate and damage the mucous membranes at the corners of the mouth, leading to cracking. To prevent this, cut pineapple into smaller pieces before consumption.

2. Vitamin Deficiency

Long-term insufficient intake of B-complex vitamins and vitamin C may also lead to cracked corners of the mouth. It is important in daily life to increase consumption of foods rich in B-complex vitamins and vitamin C.

3. Malnutrition

Malnutrition may be related to inadequate nutrient intake, poor absorption, or excessive nutrient consumption. Chronic malnutrition, especially deficiencies in protein and trace elements, can cause the aforementioned symptoms. This condition may be accompanied by general fatigue and weight loss. Treatment may require medications such as vitamin B complex tablets, vitamin C effervescent tablets, and zinc sulfate oral solution, as directed by a physician.

4. Allergic Reaction

Some individuals may have an allergic reaction to bromelain (pineapple enzyme). After consuming pineapple, the body may mount an immune response, resulting in cracked corners of the mouth. This may be accompanied by symptoms such as rash and itching. Patients should take antihistamines such as loratadine tablets, levocetirizine hydrochloride tablets, or diphenhydramine hydrochloride tablets as prescribed by a doctor.

5. Angular Cheilitis

Infection, malnutrition, trauma, and other factors can all trigger angular cheilitis. Consuming irritants such as pineapple may worsen existing symptoms or provoke new inflammatory responses, leading to cracked mouth corners. Symptoms may include redness, blistering, and discomfort. Treatment under medical supervision may include acyclovir ointment, erythromycin ointment, or compound chlorhexidine mouthwash.

To maintain oral and lip health, it is important to maintain a balanced diet, consume adequate vitamins and trace elements, and avoid excessive intake of irritating foods.