Autoimmune Thyroid Disorder in a 15-Year-Old Female with Concurrent Dengue: A Case Study

We report a case of a 15-year-old female who presented with high grade fever and thrombocytopenia, slightly elevated creatinine levels, initially diagnosed with dengue fever.Elevated LDH and Ferritin level indicated the severity of dengue, yet after 7 days of treatment, her elevated creatinine levels remained unchanged, prompting further investigation.Thyroid function tests revealed severe hypothyroidism with a TSH level exceeding 250 IU/mL and antibody testing (Anti-Tg and Anti-TPO) confirmed autoimmune thyroiditis (Hashimoto's Thyroiditis).This case highlights the importance of considering underlying autoimmune conditions in patients with persistent abnormal laboratory findings, even in the context of infectious diseases such as dengue.After initiating thyroid hormone replacement therapy, the patient's creatinine levels returned to normal and she is expected to lead a healthy life with ongoing management.Early detection and treatment of thyroid disorders are crucial to preventing further complications, particularly in patients with coexisting conditions.This case emphasizes the need for thorough diagnostic evaluation in patients whose clinical abnormalities don't resolve with initial treatment modalities.