What are the causes of lethargy?
<answer> Diseases of the neurological system, lack of exercise, alcohol use, or eating disorders. <context> Other times, lethargy can be caused by lack of exercise, alcohol use, or eating disorders. In these cases, the less you do, the more lethargic you can feel, and this can become a vicious cycle that is difficult to overcome. This could lead to disorders, such as depression or anxiety, which also have related lethargy.