Brain-sickness refers to any disorder or disease that affects a person's cognitive abilities or mental health. While this term is quite uncommon, there are several other words that are commonly used as synonyms for brain-sickness. These include mental illness, psychiatric disorder, cognitive impairment, neurological disorder, and mental disorder. Each of these terms describes conditions that affect an individual's mental or cognitive abilities, often requiring medical intervention to manage. These conditions can range from mild anxiety and depression to severe conditions like schizophrenia or dementia. Regardless of the term used to describe these conditions, seeking treatment early is critical to ensuring the best possible outcome and improving overall quality of life.