Stress is thought to contribute to canker sores through several mechanisms, though the exact cause is not fully understood.

Immune System Suppression

Stress can weaken the immune system, making the body less effective at managing minor injuries or inflammation in the mouth, which can lead to canker sores.

Increased Inflammation

Chronic stress can cause an inflammatory response in the body. This heightened state of inflammation may contribute to the development of sores.

Behavioral Factors

Stress often leads to habits like biting the inside of the cheeks.

Hormonal Changes

Stress causes the release of cortisol and other stress hormones, which may disrupt the balance of chemicals in the body and affect the oral mucosa.

Nutritional Deficiencies

Stress can sometimes lead to poor eating habits, which may result in deficiencies in nutrients like B vitamins, zinc, or iron - factors known to be associated with canker sores.