Addison disease is a disorder where the adrenal glands do not produce enough hormones. The adrenal glands release hormones that regulate blood sugar, immune response, and stress response. Damage to the adrenal cortex can cause too low of hormone levels. Symptoms include fatigue, weight loss, and low blood pressure. Treatment involves lifelong hormone replacement therapy. With proper treatment, most people can live normal lives, though complications can occur if hormone levels become too high or low.