@Velvetchocolate
Yes - ‘why are you absent’
‘Because I am not well enough to come to work.’
should do it, surely?
Not really.
You might have chickenpox and that affects your colleague who is 11 weeks pregnant because she hasn't had it before, or another who is taking immunosuppressant medication/his partner is having chemo.
There could be several people off with something that turns out to be the result of a poorly maintained air conditioning system. Somebody in the canteen might not be following proper food hygiene practices. There could be a boiler giving off carbon monoxide and it's not noticed if everybody who has time off is unwilling to say their symptoms. At the more ridiculous end of the spectrum, there might be somebody adding laxatives or worse to the sugar tub because they're pissed off about something or just an absolute minger who doesn't wash his hands after he's had a shit and then digs around in the communal biscuit tin for his favourite custard creams.
Sometimes people are taking the piss. But on the other hand, being able to say to someone 'you've had five migraines and seven 'tripped over', two 'sprained wrists', 'burned face and chest with coffee', one 'fell downstairs' and two cupboard doors you've walked into over the last fifteen months. We're worried that you are either unwell and need to see your GP in case these are all connected or these are not accidents' can be something good.
Having a 'none of your business' option sounds good in theory, but in practice, it can make things harder.
Now, that doesn't mean it's OK to send an all staff email notifying everybody of your medical or social circumstances or your health should form part of the office's general conversation - but telling either your line manager or, if it's something awkward or embarrassing, being able to tell somebody else (I'd tell my LM 'Women stuff, I've explained properly to Naomi' but she would be told 'I flooded all through my clothes on the way in, so had to go back home, clean up and change', for example) does enable employers to also be more supportive and responsible employers.