Dear [Teacher's Name],

I hope this message finds you well. I am writing to inform you that I am unable to attend class due to illness. Unfortunately, I have been feeling unwell and have been advised by my doctor to rest at home for the next [number] days to ensure a full recovery.

I apologize for any inconvenience this may cause and will make sure to catch up on any missed work or assignments as soon as possible. Please let me know if there are any specific tasks or materials I need to focus on during my absence.

Thank you for your understanding and support.

Best regards,

[Your Name]

[Date]

This note serves as a formal request for permission to take leave from classes due to health reasons. I trust that you will consider my situation favorably, and I look forward to returning to class soon.