The former Home and Away actress has returned home to the Gold Coast in Australia to be with her husband Nate Myles, 29, who she married in 2012.
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Tessa's representatives released a statement to the Daily Telegraph about the heartbreaking news.
"Tessa will be undergoing chemotherapy over the next few months," they said.
"Tessa and Nate would like to thank all for their well wishes and would ask for privacy during this very difficult time.
"She is a much valued and loved member of the Home and Away family. She has a wonderful approach to life.
"She has always been health conscious and is full of spirit.
"She will tackle the next six months with great determination and we wish her all the best for a speedy recovery and send all our love."
Tessa posted an inspiring message to her Instagram following the shocking news.
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Our thoughts are with Tessa James and her family at this time.