Ali Feller, the 40-year-old host of podcast"Ali on the Run Show," has revealed her breast cancer has returned and has turned metastatic.

On June 6, just eight months after completing treatment and being declared cancer-free, Feller shared on Instagram that she has Stage 4 breast cancer that has spread to her bones.

"This intense, debilitating, at times immobilizing pain came out of nowhere," Feller, a running enthusiast who participated in the Boston Marathon in April, captioned a photo of herself lying in a hospital bed.

"It was mild at first. It was there in Boston. It was bad by London. The weekend of my birthday party, I was riding on adrenaline, but by the end of each night, I could barely move," she wrote.

Feller, who is mom to a 6-year-old daughter named Annie, said her canc

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