Training while sick

I am sick a lot.  It’s just a part and parcel of my lack of luck with my immune system being shitty. Lots of cold, lots of flu symptoms.  These days I get a lot less muscle strains / aches and damage, but that’s mostly because I’ve slowly gotten pass the ‘I am a weakling stage’/

So, should you train while sick? From what I’ve read – it seems to be a case of – it’s mild sure.  If it’s a flu – no.  If it’s below the neck; no.

My problem is that a lot of the time, I have a cough / cold addition.  That sucks because it’s hard to do anything because your cardio is out and doing a major routine like the MMA training requires a lot more energy / oxygen than I can handle.

It’s weird, but being an adult sometimes means staying away from things even when you want to do it.  Bah!