Functional neurological disorder (FND) is a medical condition that affects how the brain receives and sends information to the rest of the body. It is often helpful to think of the brain as a computer, where there is no damage to the hardware or structure of the brain, but the software or program running on the computer is not working properly. FND can encompass a wide variety of neurological symptoms, such as limb weakness or seizures, and can be difficult to diagnose. FND has two primary categories: psychogenic nonepileptic seizures (PNES) and functional movement disorder (FMD) . There are many types of FND, with a diverse mix and range of neurological symptoms and disorders. The exact cause of FND is unknown, but it is believed to have biological, psychological, and social risk factors and events that trigger it. There are no specific tests to confirm that someone has FND, and conventional tests such as MRI brain scans and EEGs are usually normal in patients with FND. However, early diagnosis and treatment can help lessen symptoms and aid in healing.