PEM: It's Time to Retire the Term by Pete Hanauer It is long past time to retire the term PEM and replace it with somethingthat accurately reflects what happens to ME/CFS patients after physical or mental exertion and that respects their dignity. We suggest the term Post Exertional Disability, or PED. When patients must sit down or lie down after the slightest exertion, or are confined to bed or home, because they lack the energy to perform even routine tasks, they are, in a very real sense, disabled. My comment: I am sure PEM could be updated, but it's not good to keep swapping terms. It just creates confusion. Perhaps it is better to wait a bit longer until the term is not only a description of symptoms, but also a description based on biomedical research of what is going on? PEM, PENE, PED all underline the same thing, deterioration after exertion. My problem with this is that the term suggest we're fine as long as we don't exert ourselves, and that's not accurate. What are your thoughts?