Brain fog 2021-01-31T18:36:08Z Mental clouding Brain fog is a type of transient cognitive dysfunction that comprises a constellation of symptoms that impair intellectual functioning to a level that interferes with daily activities, commonly including forgetfulness, mental slowness, difficulty thinking or focusing, a perceived slowing of mental processing speed, inability to find the right words, a sensation that the mind went blank or is "cloudy". Brain fog tends to recur and may be triggered by factors such as physical fatigue, lack of sleep, and prolonged standing or may appear to occur spontaneously. Mental fog Mental fatigue Brain fog has been reported in a range of diseases including myalgic encephalomyelitis/chronic fatigue syndrome, non-celiac gluten disease, postural tachycardia syndrome, lupus, and COVID-19. Cognitive impairment