We are looking for individuals to participate in a study that looks at the relationship between endorphins in plasma and human immunodeficiency virus (HIV) associated chronic pain. To participate in this study we are looking for people with or without HIV between the ages of 19 and 64 years old, free from serious medical conditions, and able to come to two testing sessions one week apart. Participants will receive up to $200 for completing the study. You may not be eligible to participate if you have significant health problems, are pregnant, or are taking certain medications. Please email, jxjuncos@uabmc.edu, or call 205-934-6609. Leave a short message with your name, number and mention that you are interested in the Chronic Widespread Pain in HIV study.