
24/09/2025
Brain diseases are conditions that affect the structure or function of the brain, causing a wide range of symptoms and impacts on thought, speech, emotion, and movement. Common types include neurodegenerative diseases (like Alzheimer's disease and Parkinson's disease ) , infections (such as encephalitis ) , brain tumors , epilepsy , and strokes . Many brain diseases involve neuroinflammation , an immune response that plays a role in almost all major neurological and neuropsychiatric disorders.