Pain Phenotyping of Rheumatic Diseases - An Observational Study

* INCLUSION CRITERIA Inclusion Criteria for Subjects Suspected or Diagnosed with Rheumatic Diseases In order to be eligible to participate in this study, an individual must meet all of the following criteria: 1. Stated willingness to comply with all study procedures and availability for the duration of the study 2. Aged 9-85 years 3. Diagnosed or suspected of having a rheumatic disease. 4. Ability of the subject to understand and the willingness to sign a written informed consent document or assent. 5. Must be enrolled in one of the NIAMS protocols (01-AR-0227, 94-AR-0066, 11-AR-0223) 6. To be able to answer PRO questionnaires in either English and/or Spanish languages. Inclusion Criteria Healthy Volunteers 1. Stated willingness to comply with all study procedures and availability for the duration of the study 2. Aged 9-85 years 3. No known history of a rheumatic disease or any other chronic medical illness. 4. Ability of the subject to understand and the willingness to sign a written informed consent document or assent. 5. To be enrolled in either of the ongoing NIAMS protocols 01-AR-0227, 94-AR-0066, or 11-AR-0223. 6. To be able to answer PRO questionnaires in either English and/or Spanish languages. EXCLUSION CRITERIA An individual who meets any of the following criteria will be excluded from participation in this study: 1. Treatment with investigational drug or other investigational intervention while enrolled in this study. 2. Any physical exam finding that precludes bedside QST. 3. Developmental delay or cognitive impairment that interfere with following or understanding the test instructions. 4. Subjects using illicit or street drugs will be excluded. Subjects taking prescribed pain medications will not be excluded. 5. Any chronic medical condition that may hinder participation in the study as determined by the study PI.