Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs PseudogoutUpdated: 2020-07-16OverviewPseudogout is a form of arthritis with sudden, painful swelling in 1 or more joints. The knee is often affected. The condition is caused by crystals that form in the joint. It's also known as calcium pyrophosphate deposition disease or CPPD.SymptomsAffected joints can be swollen, warm and extremely painful. Discomfort can last for days or weeks.TreatmentsMedications and draining the joint can help relieve pain. © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use