Hashimoto's encephalopathy is a rare autoimmune disorder that affects the brain. It's also known as steroid-responsive encephalopathy associated with autoimmune thyroiditis (SREAT) or nonvasculitic autoimmune meningoencephalitis (NAIM). These terms refer to the inflammation of the brain and meninges, which causes a range of neurological symptoms such as confusion, tremors, seizures, and memory loss. Other synonyms for Hashimoto's encephalopathy include autoimmune encephalopathy, thyroid encephalopathy, and autoimmune limbic encephalitis. Due to its rare nature, Hashimoto's encephalopathy is often misdiagnosed, making it crucial for medical professionals to be aware of all its synonyms to provide the best treatment for the patient.