Junior doctors hold placards during a strike, amid a dispute with the government over pay, in London, Britain April 11, 2023.
Senior doctors, known as consultants, began a 48-hour walkout on Tuesday and will be joined by junior doctors on Wednesday.
They are due to hold three further days of joint strike action next month.
Doctors have said they will operate Christmas Day levels of service, providing emergency care.
In July, junior doctors were awarded a 6% pay rise and 1,250 pounds ($1,547) for 2023/24, but the British Medical Association trade union says they are still facing a pay cut in real terms.
Persons:
Maja Smiejkowska, we've, Steve Barclay, Rishi Sunak, Vishal Sharma, Sunak, Barclay, Kylie MacLellan
Organizations:
REUTERS, Sky News, Health Service, British Medical Association, BMA, RPI, Times Radio, Thomson
Locations:
London, Britain, England, France, Italy