[youtube http://www.youtube.com/watch?feature=player_embedded&v=_tbNetqV6LA]

Karen Deeming was a healthy 48-year-old living in Los Banos, Calif., and working on her master’s degree in anthropology and archaeology. Then, in late 2012, a few weeks after returning from a dig in Mariposa, Calif., Deeming began to feel sick. A chest x-ray turned up bilateral pneumonia and masses in her lungs.

What followed was eight months of debilitating illness. And she’s not better yet.

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If you suspect that Karen had lung cancer, you’re wrong. She had something else — and she isn’t alone. Cases of her illness are on the rise: In 1998, there were 2,000. In 2011, there were around 23,000.

To find out what Karen’s illness is — and whether you’re at risk — watch the video above.

This story first appeared on Mother Jones as part of the Climate Desk collaboration.