The union protects bad employees who take advantage of sick leave. If you miss too many days regardless the reason you will be put on an attendance program. I’ve know people who were diagnosed with cancer and still put on the attendance program.
You don’t get sick days and if you’re sick too much, it’s up to your manager if they decide to put you on the attendance management program . Occ health is not supportive of sick time and harasses you to get back to work even with doctors note.