If it would help, it would only help out for about a weeks worth of material in my mind, maybe less. I may not know for sure, but I can only imagine undergrad being a small portion of anything.
I'd say take the class if you're interested so you can do well in it too.
If you examine the list of leading causes of death, you will find two at the top: heart disease and cancer. While there are certainly genetic factors that contribute to heart diesease, the vast mojority of cases stem from health behavior...psychology. The number one cause of cancer related death is lung cancer. While not exclusively attributed to smoking, the vast majority of lung cancer cases originate from smoking, a behavior....psychology. Think of the millions of lives that are taken anually by these diseases. The appreciation and understanding of behavior should certainly be near the pinnacle of a medical practice.....if we are in the business of saving lives.....let alone preventing pathology.
yes it will
Read Learned Optimism by Martin Seligman, a notable psychologist famous for his work on learned helplessness. Its not so much a self-help book as it is a review of the experiments and literature surrounding explanatory style and longevity. In my unqualified opinion, I'd say stress plays an important role in all of the major diseases. This book will give you good insight into how the field of psychology has greatly enhanced medical care.
By the way, the psyc that is taught in medical school during the pre-clinical years is disappointing to me. It's heavily focused on pharmacology and diagnostic criteria. There's dancing around certain concepts, but you never get a feel for how it could be useful, or it might be implemented. I guess that's what years 3 and 4 are for.