Bronchial thermoplasty is a medical procedure used to treat severe asthma. It involves using a special device to deliver controlled heat to the airway walls, which reduces the amount of smooth muscle in the bronchi. This helps to decrease the frequency and severity of asthma attacks by making the airways less reactive to triggers. The procedure is typically performed in three sessions, each targeting different areas of the lungs. Patients may experience some mild discomfort or temporary worsening of asthma symptoms after treatment, but many report improved breathing and a reduction in the need for medication over time.