Writing an effective excuse letter for college absence due to sickness involves being clear and polite. Begin by addressing the principal, stating your name, department, and roll number. Clearly mention the dates of your absence and the reason for it. Apologize for any inconvenience caused and assure that you will catch up on missed work. Conclude with a thank you and your contact information. Avoid unclear language and make sure to include all necessary details.
Sample Apology Letter for Absence Due to Sickness
To,
The Principal,
_______________ (Name of the College),
_______________ (Address)
Date: __/__/____ (Date)
Subject: Apology for Absence Due to Sickness
Respected Sir/Madam,
I am ____________ (Name of the Student) from __________ (Name of the Department) of your esteemed college, bearing roll number _______________(Roll Number).
I am writing this letter regarding my absence from __/__/____(Start Date) to __/__/____(End Date) due to illness. I was unwell and unable to attend classes during this period.
I apologize for the unexpected leave and assure you that I will diligently cover all missed syllabus at the earliest. I understand your consideration and seek forgiveness for any inconvenience caused.
Thanking you,
Yours Truly,
_______ (Your Name)
_______ (Roll Number)
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Deepanshu Thakral 
Kshitij Tarun