Outside of sick leave, how many sick days are acceptable in your organisation before HR is involved?
It's been years since I've worked in a larger company or organisation but from memory; if it was more than 2 days in a row you'd have a conversation with your line manager at least to fill out a return to work form (I think?) and to have a conversation about whether any further support was needed.
I currently work in a very small, very disorganised family business without official HR, where one member of staff is now on an average of 2.75 sick days per month.
Genuinely wondering, what would happen in your place of work in this situation?