I've been pretty good on the sickness front this year - last year when I had a huge amount of personal shit in my life my sick record was a bit poor, after being signed off work for 2 weeks with stress (family court shite), the boss had the fucking nerve to call me into his office, say that I had a "pattern of sick"

(twat) and referred me to occupational health.
They were fine - I explained about the stuff in my life in general manner, then moved onto the stresses at work - pointing out that we have an increased workload, staff aren't replaced who leave, when staff who have parenting obligations come back part-time it means there is more workload spread around, there is also an unequal workload amongst staff, etc etc
The occy health bod nodded and knew about our department and asked if I wanted it on record - otherwise she wouldn't be able to do anything about it. She was pretty savvy actually, a doctor who was in the occy health dept of the NHS and knew about the stress that most NHS workers were under...
I figured that bollox to them, unless someone would have it officially on the record about stress then nothing would change, I'm not going to be there in 5 years time, so bollox to them.
... funnily enough, since then I've sorted out a lot of stuff in my life and my sick leave is fine. I don't take the piss (although the NHS 'owes' me 2 days annual leave as I was diddled out of 2 days leave under Agenda for Change - so I pull at least 2 sickies as 'compensation'

) and my sick leave is fine.
We have this fucking stupid system whereby more than 3 instances of sick leave in 6 months and you're referred to occy health (1 instance is counted as 1 day) - so there is the incentive to not have a day off or a week off, as they are all counted as 'one instance' , so if you have kids and get loads of bug infections, you go along to occy health and say "hello, I've had colds/the shits/migraine etc" and it's all a box ticking exercise isn't it?
... so the added effect is that we have the 'mucus troopers' , people come in ill , spread their illness (because they don't want to get referred to occy health), we get more ill, the cycle continues, annoying to say the least it is!
nowadays when I'm ill, I make sure others know a day or so before that I'm feeling ropey then phone in the next day, saying to my line manager something along the lines of "I'm shitting through the eye of a needle"

... that usually covers it!