The Health Secretary says this action will cause discomfort, uncertainty and difficulty.
I'm at Peterborough City Hospital to find out first hand what the impact is.
Around 80 non-urgent clinic appointments were cancelled ahead of the strike. Only two operations have been postponed.
Around a third of doctors are not members of the BMA and of those that are, 21% of GPs and 15% of hospital consultants voted against industrial action.