Forgetting is the apparent loss or inability to recall information that has been encoded and stored in memory. There are two main types of forgetting: natural forgetting, which occurs normally over time, and morbid forgetting, which involves deliberately trying to forget something. Forgetting can also be classified as physical, due to factors like age, disease, or injury affecting the brain, or psychological, due to stress, emotions, or lack of interest interfering with memory recall. The main causes of forgetting include inadequate initial learning or encoding of information, the passage of time, interference from new learning, strong emotions, poor health, lack of repetition, and distractions.