A few weeks ago I caught a cold. A nasty cold that Lemsip, Day Nurse and all manner of other pills and potions just wouldn't shift. Bah!
It just so happened that that same week I was going to have my eyes tested. "Oh dear", said the optician upon inspecting my peepers. "I can see you suffer from hayfever. You top and bottom eyelids are really red." And being an expert I guess she knew what she was talking about on the red eye front.
I was flabbergasted. I don't suffer from hayfever. Well, I never have done before. Well, I don't think I have. But I know it can develop later in life. So maybe this was it. I would be henceforth forever cursed with sneezing, that bunged up feeling and itchy eyes.
So how do you know if you have actually hayfever or a cold?
The acid test is... do you have green snot?
Hayfever gives every impression of being a cold but WITHOUT the green snot. Hayfever is basically your immune system going into overdrive believing (incorrectly) that your body has an infection so you get all those wretched fever-like symptoms (hence the name) as your body spins it's wheels in the dirt trying and punch thin air as it tries to fight something you don't actually have. It's just as bad as a cold but not actually a cold.
However if you DO have green snot you have an infection i.e. a cold.