I wanted to ask what the causes of severe memory loss are. Had no problems 3 weeks ago. My last 2 blend together and I have a hard time remembering.?

Numerous causes. Including intrinsic problems with the brain such as strokes and other illnesses, psychiatric illnesses such as depression, metabolic syndromes, medications, head injuries, etc. If you’re having problems with your memory whether it’s been a sudden onset or it’s been coming on for some time, please have an evaluation as soon as possible. Many causes are treatable. Good luck!