Mesothelioma Is Mostly a Men's Disease, and Women's Cases Look Different

Mesothelioma reads, in the national numbers, as a disease that mostly happens to men. From 2003 to 2022, the United States recorded 63,620 cases, and men accounted for 47,973 of them. That is about three cases in every four, a ratio close to three to one.

The imbalance is not a quirk of one dataset. It shows up again, and more sharply, in who dies. Federal mortality data for 1999 to 2015 counted 45,221 mesothelioma deaths, and 79.8% of them were men.

A Ratio That Traces to Old Jobs

The reason sits in the 20th-century workplace. The heaviest asbestos exposure happened in a specific set of industries: mining and milling, manufacturing, shipbuilding and repair, and construction. Those trades were overwhelmingly staffed by men, so the exposure, and the cancer that follows it decades later, landed mostly on men.

The pattern is a kind of fingerprint. Because mesothelioma surfaces 20 to 50 years after exposure, today’s case counts are a delayed readout of who worked around asbestos two and three generations ago, and the sex ratio is one of the clearest marks that occupation left on the data.

Where Women’s Cases Diverge

The split is not only about how many. It is also about which form of the disease appears. Most mesothelioma is pleural, forming in the lining of the lungs, and that holds for both sexes. But the abdominal form, peritoneal mesothelioma, makes up a much larger share of women’s cases.

Peritoneal mesothelioma is about one in five of women’s cases and roughly one in twelve of men’s. The two forms carry very different treatment paths and survival odds, a divide covered in our look at how the location of the tumor shapes survival. For a woman tracing a diagnosis, that means the odds she is facing the abdominal form, rather than the lung-lining form, are meaningfully higher than they are for a man.

What the Gap Does Not Say

The numbers describe a pattern, not a personal risk score. A three-to-one ratio across the country does not mean any individual man is destined for the disease or that any individual woman is safe from it. Mesothelioma remains rare in absolute terms, and the same asbestos fibers cause it regardless of who breathes them.

What the gap does is point back to the source. When a cancer sorts this cleanly by sex, it is usually because exposure sorted that way first, and for mesothelioma the exposure was work.