I'm having a lot of memory loss will a brain scan show if there is anything wrong with my brain?

Yes: A brain scan will tell you if anything is wrong with the brain but that would not be the first step. Seeing your primary doctor is a good place to start, who may then send you to a neurologist or memory specialist who can determine the need for a brain scan. Evaluations include neuropsychiatric testing, screening for mood disorder, lab work, CSF tests, med side effects, sleep disorders, and more.

Maybe: Memory loss can be a natural part of aging, it can happen in conditions that are degenerative such as alzheimer's disease. Conditions in the brain can be picked up by mr scanning such as white matter disease etc but a negative mr scan does not mean you can't have memory loss.

Not necessarily: Current brain scans like MRI do not reliably pick up problems in how your brain operates -- they're more focused on physical anatomy. There are functional brain scans which are more used in research, and which can pick up differences in regional brain activity. A brain scan would be part of a comprehensive workup for anyone with memory loss -- but at age 23, trauma would be a more likely cause.