Yes, they could be linked to other causes. In fact, those things ARE linked to other causes. But it seems like they are ALSO related to long covid. That's what

Yes, they could be linked to other causes. In fact, those things ARE linked to other causes. But it seems like they are ALSO related to long covid. That's what the research is trying to prove or disprove. It does this by looking at data from people who do have covid vs people who don't. And the research find that people who have covid, are more likely to have these symptoms. And they had more of these symptoms vs non-covid people 30 to 250 days later. As with all research, this is just one study of 300 patients. So no one should be "confident" based on just this study. That's why other researchers will try to do similar studies. That's also why studies explain a lot about who they studied. For example, in this study 70% of people who had covid were women. Could these symptoms be caused by their gender? Probably more likely the covid, but maybe that's something to consider for studies in case it shows up again in the future. Others have linked to the study. It's worth at least reading the abstract. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0254347 https://journals.plos.org/plosone/article?id=10.1371/journal...