Post Exertional Malaise (or PEM) is one of the most common symptoms of many chronic illnesses, and is one of the defining symptoms of Myalgic Encephalomyelitis (ME/CFS). This very limiting symptom is something that likes to rear its ugly head even when you think you’ve been so careful. And can come in many forms – sometimes I don’t even realise it’s what I am experiencing until my husband reminds me I have overdone it and what I am experiencing is the result of that. The dreaded PEM. As it’s such an important part of my life with ME/CFS, I thought it was high time I shared a bit more about…