Terry Fox was diagnosed with osteosarcoma (a form of bone cancer) in March 1977, when he was 18 years old.

Quick Scoop

Here’s the key detail you’re looking for:

  • Terry Fox first went to the hospital for worsening leg pain in early 1977.
  • He was officially diagnosed with osteosarcoma in March 1977.
  • The diagnosis led to the amputation of his right leg later that year and the start of about 16 months of chemotherapy.

In short, when people ask “when was Terry Fox diagnosed with cancer” , the historically supported answer is March 1977, the year he was 18.

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