CRP and subacute thyroiditis: He did not have any significant localizing symptoms, except for a mild headache, and his examination findings were unremarkable as well. Investigations revealed a high erythrocyte sedimentation rate (ESR), high C-reactive protein (CRP) levels, and a deranged thyroid profile, with high free T3 and T4 and suppressed thyroid-stimulating hormone (TSH) levels, suggestive of subacute thyroiditis.