The Brief Pain Inventory (BPI) is a standardized questionnaire designed to assess pain intensity and its impact on daily functioning. It helps healthcare providers understand a patient's pain experience by evaluating both the severity of pain and how it interferes with activities such as work, sleep, and enjoyment of life. The BPI consists of a series of questions that patients answer, providing valuable information for treatment planning. It is commonly used in clinical settings and research to monitor pain over time and evaluate the effectiveness of pain management strategies.