Why did your t4 increase?

An increase in T4 levels can occur due to various factors, including an overactive thyroid gland (hyperthyroidism), which can be caused by conditions such as Graves' disease or thyroid nodules. It may also result from increased intake of thyroid hormones through medication or supplements. Additionally, factors like stress, illness, or changes in diet can influence hormone production and metabolism. It's essential to consult a healthcare professional for accurate diagnosis and management of thyroid function.