Answer by  
                                                                                          DrMom (854)
                                                            
                          
                          
                                                          One cause of lethargy might be inadequate sleep. Depression can make a person lethargic. Anemia, chronic fatigue, diabetes, fever, emotional stress - all of these may contribute to feelings of lethargy. In any case, if lethargy is present persistently, you need to seek medical care.