Mouth ulcers are often the result of a combination of factors, with menstruation being one of the triggers. Mouth ulcers, commonly known as canker sores, are a common ulcerative and injurious condition that occurs in the oral mucosa. This disease is mainly caused by a combination of factors, including stress, food, drugs, malnutrition, changes in hormone levels or vitamin or trace element deficiencies, decreased immunity and so on, may trigger mouth ulcers. The appearance of mouth ulcers, must pay attention to oral hygiene, do not eat fire, stimulate things, it is recommended to drink a lot of water, you can use some medication for symptomatic treatment, usually must enhance the resistance and immunity, it is recommended to exercise more.