I don't know about CS but if you are thinking of doing a PhD in the biomedical field, do it only if you are really really really attracted by the idea of doing

I don't know about CS but if you are thinking of doing a PhD in the biomedical field, do it only if you are really really really attracted by the idea of doing research and knowing that there is about 1 academic job for every 10-15 people who start PhD. Competition is fierce, pay is miserable, be sure you are in love with the job.