What are common symptoms of Alzheimer's disease regardless of stage?

Hi Aleq! We are constantly learning more about Alzheimer's as new research comes and we really share with each other the experiences of our loved ones. So, this is a hard question to answer. However, there are a lot of resources available on this website that you can look to.
I've included some links to articles about early stage symtpoms, many of which, like mood swings and lanugage problems, I've personally found persist throughout the arch of the disease. However, that's only in my limited experience. I hope you find some of these articles to be helpful.
https://alzheimersdisease.net/symptoms/mood-changes
https://alzheimersdisease.net/symptoms/memory-loss