An employee writing a sick leave letter should present all necessary details regarding why she needs to leave in a convincing, respectful manner. The letter also express dedication to the job and a desire and intent to return to the company after the leave is finished.
If possible, a sick leave letter should include the date the leave is effective and the date the employee plans on returning to work. If the employee is unable to provide specific dates, she should state her intent to keep the employer updated on her situation. Attaching a medical certificate or a letter from a doctor is also helpful.