Have you recently been tired? Have you recently been endo-tired? If yes, you’re very likely to know the difference. Explaining how you feel to the rest of the world is a different matter altogether. One online source claims that “Grinding fatigue as severe as that experienced with advanced cancer is present in most cases.” It’s accepted that the reasons for this extreme exhaustion associated with the condition are still unknown. It might be the chronic pain, it might be a hormonal imbalance. More research is needed. More awareness would help.