While people with allergies have to worry about all sorts of things, including food allergies, hay fever and asthma, one thing that they can worry less about is getting a brain tumor. A variety of different studies have looked at possible associations between brain tumors and allergies. A recent study that pooled this data showed that having allergies or asthma reduced the risk of developing certain types of brain cancer by about 50%. It is important to note, however, that these studies only looked at associations, not necessarily true cause-and-effect relationships between allergies/asthma and brain tumors.
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