未必是好事，说明你的免疫系统被削弱了！过敏病与免疫系统太活跃有关，过敏病患者得癌症几率要低很多。。。

  from allergy-sufferers-less-likely-to-get-cancer/

Turns out cancer may be something to sneeze at.

Allergy sufferers are much less likely to get cancer than people who aren’t tormented by runny noses, itchy eyes and coughs, according to a series of surprising new scientific studies.

Texas Tech researchers revealed this month that asthmatics were 30 percent less likely to get ovarian cancer than non-asthmatics. And kids with airborne allergies were 40 percent less likely to get leukemia, according to research published in January by University of Minnesota doctors.

Cornell University experts found reduced rates among lung, skin, throat and intestinal cancers.

“More work is still needed, but the numbers show allergy is a statistically significant protective factor,” said Dr. Zuber Mulla, a Texas Tech epidemiologist who led the ovarian-cancer study.

“Allergies are a general activation of our immune systems,” added Dr. Ronald Crystal, chief of pulmonary and critical-care medicine at New York-Presbyterian/Weill Cornell Medical Center.

“It’s hard to prove, and I’ve heard some skepticism, but it’s a concept in this field and the studies add to that.”

Evidence on the link has been pouring out in the last few years.

A team at Brigham Young University saw a lower risk of non-Hodgkin’s lymphoma and stomach cancer, while Harvard epidemiologists “observed a strong inverse relationship” between brain cancer and asthma, eczema, hay fever or allergy.

Doctors in Toronto concluded, “Having allergies or hay fever was associated with a reduced pancreas-cancer risk” — by as much as 58 percent.

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