BREAST cancer survivor Novlene Williams-Mills, who revealed she is now struggling with a thyroid infection, has made it to the final of the women’s 400m in a season’s best of 50.47 seconds.

“I am having some issues. I have a thyroid infection so it has been rough to cope every day. I have no energy. It has been rough for me,” Williams-Mills revealed following her then season’s best 51.07 seconds clocking to advance to the semi-finals.

Despite her struggles, Williams-Mills turned up for her semi-final and lowered her seasonal best to 50.47 seconds, this time finishing third behind Allyson Felix (49.89) of the United States and teammate Shericka Jackson in 50.03 seconds and booked her spot in the final.

“Anytime you go into a Championships and reach the final, it’s a big accomplishment and we are the only country that has four people in the final,” noted Williams-Mills.

Williams-Mills, who was diagnosed with cancer in June 2012, showed tremendous courage to win the 400m at Jamaica’s National Senior Championship in 50.60 seconds just a few days after being told of her condition.

A month later, she went to the London Olympics and placed fifth before winning a bronze on the 4x400m relay team. She then had surgery after the London Games.

“It’s hard,” said Williams-Mills as she held onto one of the barriers in the mixed zone, visibly catching her breath after her exhausting race.

“I am a little but rusty, as I have not run in a while, so I just came back out and tried to put a run out there and tried to move on to the next round,” she explained.

Williams-Mills, who won the 400m Diamond League series in 2014, qualified automatically to the World Championships and admitted that her preparations are far from ideal, revealing she is not fully fit.

“I would say maybe about 80 per cent, so hopefully I can come out and put a good race together in the final,” said Williams-Mills.