Autoimmune switch from hyperthyroidism to hypothyroidism in Graves' disease

Area of Science:

• Endocrinology
• Immunology

Background:

• Graves' disease is a common cause of hyperthyroidism, often associated with thyroid stimulating hormone receptor-stimulating antibodies (TS Ab).
• Autoimmune hypothyroidism is typically caused by Hashimoto's disease, involving different antibody profiles.

Observation:

• A 21-year-old woman with Graves' disease spontaneously developed hypothyroidism within a year.
• This clinical switch suggests a change in the underlying autoimmune process.

Findings:

• The patient's condition shifted from hyperthyroidism to hypothyroidism, a rare occurrence.
• We hypothesize a switch in antibody dominance from TS Ab to TSH receptor-blocking antibodies (TB Ab) in this case.

Implications:

• This case highlights a rare antibody switch phenomenon in autoimmune thyroid disease.
• Optimal management strategies for this rare condition require further investigation.
• Challenges in managing reproductive-aged patients include adherence and follow-up.