Is trouble reading long emails related to ADHD?

Yes, this is very commonly related to ADHD. Long emails place a heavy load on attention, working memory, and executive functioning. Your brain has to hold multiple ideas at once, track what matters, filter what does not, and decide what action is needed. That can be exhausting, even if the content is important. Many adults with ADHD avoid long emails not because they do not care, but because the mental effort required feels disproportionate. This is not a reading problem or lack of intelligence. It is cognitive fatigue. Breaking emails into chunks, scanning for action items first, or asking for concise communication are valid adaptations, not shortcuts.