Why is it Bad? The truth is, biting our lips, cheeks, or tongue may cause more harm than many of us may have ever thought. When we constantly bite these delicate, soft tissues it can cause painful sores. These sores can become infected if not treated or if reopened repeatedly by even more biting.

What happens if you bite your lips too much?

Chronic lip biting can cause swelling, rawness and sores. Repeatedly biting the same area can even cause fibromas to develop. Additionally, you could end up with jaw pain and headaches.

Why do people bite their lips?

What causes lip biting? In some cases, physical conditions can cause a person to bite their lips when they use their mouth for talking or chewing. In other cases, the cause can be psychological. People may bite their lip as a physical response to an emotional state, such as stress, fear, or anxiety.