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Employees do not have to give notice in order to be absent for illness or medical leave. The very nature of illnesses or unanticipated medical issues make it typically impossible to give any advance notice, except in the case of scheduled surgeries or other treatments.
While an employee is not obligated to disclose the details of an illness, a doctor's note may be required to satisfy the employer that it is a legitimate use of sick leave. Such a note need not disclose the condition or cause, but would simply be a note from a doctor confirming absence from work for medical or health reasons. Stress leave is a recognized medical/mental health issue and you should not worry about this being any different than if you had the flu or a physical injury. It is also improper for an employer to delve into your medical condition, unless it were a case that you required to be on long term disability and required independent verification.
Your entitlement to pay during sick leave is dependent upon the terms of your employment contract, however you cannot be terminated due to a legitimate illness as this would be considered discriminatory and you would then have recourse against them.
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