Definition: Anemic refers to a condition in which the blood supply to the body is inadequate, causing low levels of red blood cells (erythrocytes) and other bodily tissues that require them. It affects multiple organ systems, including heart, lungs, kidneys, brain, and gastrointestinal tract. Anemia can be due to several causes, such as iron deficiency anemia, vitamin B12 deficiency, or chronic diseases like贫血。