A Letter of Absence From Work Due To Illness is an official document to be completed and provided by an employee to their employer in order to inform them that the employee has been absent from work due to illness. This letter explains what type of sickness the employee has, how long they have been out of work, and when they are due to return to work. It also serves as a testament that the employee has not been taking time off work for any other causes than stated in the letter. Ultimately, having this letter on file allows employers to keep track of any absences or illnesses and to ensure that employees are held accountable.