Junior doctors held a protest outside Ipswich Hospital as part of what is one of the longest walkouts of its kind in NHS history.
The latest junior doctors' strike started at 7am on Thursday and will last until the same time next Tuesday.
NHS leaders had previously warned of the strike action, saying it would have an impact on appointments.
Doctor Robert Mooney, a paediatric trainee, was one of the junior doctors on the picket line outside Ipswich Hospital on Thursday morning.
He said: "I am here today with my colleagues because I love my job, I love being a doctor, it's what I've wanted to do.
"But it is getting harder and harder to do my job.
"I feel that every year it's hard to do my job and give effective, safe, good quality health care, because of erosions in pay and the lack of staff.
"A doctor today, doing the same job as those 15 years ago, would be getting paid 23.5% less than those doing the job in 2008.
"I feel that's unfair and not acceptable.
When questioned about cancelled appointments, Dr Mooney said: "There have been increases in the waiting times, and I would say that everybody here wants there to be safe conditions, and doesn't want to wait long to see a doctor.
"The first part is, while we are on strike today, there is very good cover from consultants, non-training doctors who are providing care to those in emergencies.
"The other part is, of course there are going to be increased wait times, but that is not a new thing.
"There has been a lack of investment in healthcare for years.
"Yes, we want pay restoration today, but a big part of our goal is to increase the workforce.
"Many young doctors are going to Australia, New Zealand and Canada to work because it's better working conditions."
Another who was on the picket line today, who wished to remain anonymous, said: "We are here today to fight for a pay restoration. It has decreased in the last 15 years, and it would take a 35% pay increase to restore our pay to what it should be."
Leaders have said that these strikes will impact appointments, with Adam Cayley, chief operating officer for the NHS in the East of England, saying: "We are expecting more disruption in comparison to previous strikes, given the longer period and cumulative action by our medical professionals.
"However, any patient who needs urgent medical care should still visit their A&E department as normal, especially in emergency and life-threatening cases, where they will be treated safely.
"The NHS will continue to deliver as much planned care as possible during this period, especially for patients in greatest, clinical need.
"If you haven't already been told that your appointment has been rescheduled, please attend as normal."
While strikes were happening on Thursday, Prime Minister Rishi Sunak has said he will raise junior doctors' pay by 6%, with an additional consolidated £1,250 increase, while also telling unions to halt strike action.
He said: "Today's offer is final.
"There will be no more talks on pay.
"We will not negotiate again on this year's settlements and no amount of strikes will change our decision."
Dr Andrew Kelso, medical director at NHS Suffolk and North East Essex Integrated Care Board, said of the industrial action: "While I wholly respect everyone’s right to take this action, it is inevitable that the consequences for patients will be more far-reaching than before, with delays and disruption to care."
He has suggested actions such as keeping a supply of basic medicines, to deal with minor injuries, and using local pharmacies and NHS 111.
Consultants are due to go on strike later this month from Thursday, July 20 to Saturday, July 22.
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