In which condition would corticosteroids not be used for treatment?

Corticosteroids are powerful anti-inflammatory medications typically used to suppress the immune system and reduce inflammation, making them effective in a variety of conditions. Their use is well-established in autoimmune diseases, where they help control excessive immune responses. In symptomatic lichen planus, corticosteroids are also commonly employed to alleviate symptoms and inflammation associated with the condition. They play a critical role in treating severe allergic reactions by effectively reducing inflammation and immune response, stabilizing the patient's condition.

In contrast, corticosteroids are not typically used in the management of hyperthyroidism. The primary treatments for hyperthyroidism aim to reduce thyroid hormone levels, using methods such as antithyroid medications, radioactive iodine, or surgery. Corticosteroids do not directly target the underlying issue of excessive thyroid hormone production and can even complicate the condition by affecting the body's metabolism in a way that might not benefit the management of hyperthyroidism. Thus, it’s clear that while corticosteroids have a valuable role in treating many inflammatory and autoimmune diseases, their utility in hyperthyroidism is limited and not standard practice.