[Thiamazole-induced arthritis].

Area of Science:

• Endocrinology
• Rheumatology
• Pharmacology

Background:

• Graves' disease is an autoimmune disorder leading to hyperthyroidism.
• Thiamazole is a common antithyroid medication used to manage Graves' disease.
• Adverse drug reactions can complicate treatment regimens.

Observation:

• A 42-year-old male developed acute, asymmetrical polyarthritis affecting medium and large joints.
• Symptoms of fever and elevated inflammatory markers appeared shortly after starting thiamazole.
• The patient had recently been diagnosed with Graves' disease.

Findings:

• The patient's presentation is consistent with Antithyroid Arthritis Syndrome (AAS).
• AAS is a rare but serious adverse effect of thioamide antithyroid drugs like thiamazole.
• Clinical manifestations include myalgia, arthralgia, fever, exanthema, and polyarthritis.

Implications:

• Suspected AAS necessitates prompt discontinuation or modification of thiamazole in consultation with an endocrinologist.
• Non-steroidal anti-inflammatory drugs (NSAIDs) or corticosteroids may be required for symptom management.
• Early recognition and management of AAS are crucial for patient outcomes and treatment adherence.