Pseudo gout, medically known as calcium pyrophosphate dihydrate crystal deposition disease, presents with sudden, intense bouts of joint pain that closely mimic gout. Unlike gout, which is driven by uric acid crystals, pseudo gout is caused by the accumulation of calcium pyrophosphate crystals within the joint space. Understanding what causes pseudo gout to flare up is essential for managing this chronic condition and reducing the frequency of painful episodes. These flares are often triggered by a combination of metabolic disturbances, physical stress, and systemic illnesses that disrupt the delicate balance of joint chemistry.
Metabolic Imbalances and Systemic Illness
The primary underlying factor in pseudo gout is an imbalance in the body's metabolism of calcium and pyrophosphate. When the concentration of pyrophosphate in the blood becomes too high, it can precipitate out into the joint cartilage and synovial fluid, forming CPPD crystals. Conditions that disrupt this balance are major contributors to what causes pseudo gout to flare up, as they create an environment where crystal formation and inflammation are more likely to occur.
Hyperparathyroidism: Overactive parathyroid glands lead to elevated calcium levels in the blood, which can promote crystal formation.
Hypothyroidism: An underactive thyroid gland is strongly associated with pseudo gout, though the exact mechanism remains unclear.
Hemochromatosis: This iron overload disorder is a well-established risk factor, as excess iron can facilitate the formation of CPPD crystals.
Hypomagnesemia: Low magnesium levels in the blood have been linked to an increased risk of crystal arthritis.
Hemorrhage and Trauma
Physical stress on a joint can act as a direct trigger for what causes pseudo gout to flare up. Events that cause bleeding within the joint space are particularly significant, as blood can alter the ionic composition of the synovial fluid. This change can prompt the pre-existing CPPD crystals to become unstable and shed, initiating the inflammatory cascade.
Specific traumatic events that commonly precede a flare include:
Surgery, particularly orthopedic procedures involving the knee or wrist.
Joint aspiration or injection procedures.
Falls or accidents resulting in a joint contusion or bleeding.
Even vigorous exercise that stresses a vulnerable joint.
Crystal Shedding and Inflammatory Cascade
Once CPPD crystals are present in the joint, a flare occurs when these crystals "shed" or move from their stable deposit sites into the synovial fluid. The human immune system does not recognize these crystals as harmless; instead, immune cells called neutrophils perceive them as foreign invaders. This recognition triggers the release of powerful inflammatory mediators, such as interleukin-1beta, which are responsible for the intense pain, redness, and swelling characteristic of a pseudo gout attack.
Common Precipitating Events
Beyond metabolic disease and trauma, several other factors frequently answer the question of what causes pseudo gout to flare up. These are often related to systemic stress or acute medical events that temporarily weaken the body's regulatory systems.
