It is better to pursue a double major or a major/minor combination rather than a single major. Part of the educational process is not just preparing yourself for a professional goal, such as medicine, but is also preparing yourself as a human being who is well rounded and has taken the time to develop all aspects of their personality structure. By so doing you challenge yourself and in the process have a better chance of developing totally. In so doing you have a more rounded perspective of the issues that will face you personally and professionally.
As an example, if you are interested in medicine by all means take the appropriate courses to prepare yourself for medical school. Having said that, if you have an interest in languages, history, music, etc., avail yourself of the opportunity to learn as much as you can. In the end you will evolve more expansively and have a better perspective in addressing the various issues in life we all face both personally and professionally.