Which Pain Assessment Tool Is Most Appropriate for Mr. Santos

Mr. Santos, a 65-year-old Male, Is Admitted to the Medical-surgical Unit with Complaints of Severe Abdominal Pain. He Has a History of Chronic Pancreatitis. the Pain Is Localized in the Upper Abdomen and Radiates to His Back. the Pain Is Constant and Worsens after Meals. the Pain Score Is 8/10 on the Numeric Rating Scale (NRS)