Hayfever

That’s really interesting, as you say possibly correlation or placebo, but maybe there is something else going on.

Another fascinating thing about allergies is how they change over time. Many allergies are worse in childhood and improve, or disappear, during adolescence. The opposite also happens and people can develop allergies in young adulthood or middle age, sometimes mild like hayfever but also life threatening allergies to food or drugs. We don’t know why this happens. There are also almost unbelievable phenomena such as people becoming allergic to red meat after being bitten by a type of tick. There’s a huge amount in medicine that we don’t understand at all.