Taking a sick day.
If you have a comfortable, salaried office job, you usually get paid sick leave. But in many cases, hourly workers are not so lucky. If they get sick and don’t come in for their shift, they aren’t getting paid that day. So people end up having to ignore their illnesses and come into work anyway. (BTW, the pandemic makes a compelling case for requiring employers to give paid sick leave, because in addition to this being unfair to workers, it also creates a serious public health concern.)