I was curious as to how many people who have (other) typical ME symptoms have, or have always had, post-exertional malaise. The poll should not be completed by people who are not yet reasonably certain that they have ME/SEID, ideally by the CCC criteria, which are summarised in this thread. If people don't always get PEM following exertion (physical or mental), they should respond as people who do, unless they get PEM-free periods longer than about 2 weeks. I'm not distinguishing in this poll between spontaneous improvements and those brought about by treatment. If you're not sure whether or not you had PEM at the start, but you do now, please select 'Since getting ME/SEID as far as you recall?' This is more complicated than I envisaged at first! You can select more than one response, and you can change your choice(s). I apologise in advance if no options apply to you. I may be able to add options if they don't seem too rare or complicated! EDIT - I'm not expecting to get any meaningful stats from this - just a general picture of the variations.