Retrognathia of the mandible
Retrusion of the mandible may be caused by genetic factors, bad oral habits, trauma, temporomandibular joint disorders, rheumatoid arthritis, and other conditions. Improvements can be made depending on the specific cause. It is recommended to seek timely medical attention and receive treatment under the guidance of a doctor.

1. Genetic Factors
If one of the parents has mandibular retrusion, their child may also have a certain likelihood of developing the same condition; therefore, mandibular retrusion could be hereditary. During the growth and development stage, early intervention through orthodontic treatment—such as using functional appliances to guide forward growth of the mandible—may be beneficial.
2. Bad Oral Habits
Prolonged不良 oral habits such as finger-sucking, biting the lower lip, or tongue thrusting may lead to posterior displacement (retrusion) of the mandible. Corrective measures including wearing orthodontic appliances, psychological interventions, and oral muscle function training can help correct these habits.
3. Trauma
If a patient suffers trauma during development—such as fracture of the mandibular condyle or joint injury—it may result in severe impairment of mandibular development. It is recommended to wrap an ice pack in a towel and apply it to the injured area to promote vasoconstriction and help improve the condition.
4. Temporomandibular Joint Disorders (TMD)
This condition may be related to poor habits or infections, causing joint pain and movement disorders that affect normal function, movement, and development of the mandible. Long-term cases may lead to mandibular retrusion. Under medical supervision, medications such as ibuprofen sustained-release capsules, diclofenac sodium sustained-release tablets, and glucosamine hydrochloride capsules may be used to alleviate symptoms.
5. Rheumatoid Arthritis
Remaining in cold and damp environments for prolonged periods may trigger rheumatoid arthritis, which can affect jawbone development and eventually lead to mandibular retrusion. Patients may use medications such as Qingpeng ointment, hydrocortisone tablets, or methylprednisolone tablets under the guidance of a physician.
In daily life, it's important to develop healthy living habits, avoid excessive fatigue, and refrain from intense physical activity to prevent discomfort. It is advisable to engage in appropriate exercises such as walking or jogging according to individual conditions, which can help enhance physical immunity and support recovery.