When you're unable to attend school due to illness, it's important to notify the school authorities by submitting a sick leave application to principal. This formal letter serves as a request for permission to take leave due to health reasons. Writing a clear and respectful application can ensure that your absence is officially recorded.

A sick leave application to principal should be concise and include the following details:

1. Date: Mention the date you are submitting the application.

2. Subject: Clearly state the purpose of your application (e.g., "Sick Leave Application").

3. Reason for Absence: Briefly explain the illness or condition that is preventing you from attending school.

4. Leave Duration: Specify the number of days you will be absent.

5. Medical Proof: If necessary, attach a medical certificate or note from your doctor.

6. Closing: Politely request approval for your leave and express gratitude.

Here’s a sample:

Date: [Insert Date]
Subject: Sick Leave Application
Dear Principal,
I am [Your Name], a student of [Grade/Class], and I am writing to inform you that I am unwell due to [briefly state illness]. I kindly request sick leave from [start date] to [end date]. I have attached a medical certificate for your reference.
Thank you for your understanding.
Sincerely,
[Your Name]