As the name clearly indicates, a sick leave letter is written to inform other or concerned persons that you are affected with some health related problems and you may not be able to attend class or office for some short period. You can see a sample sick letter below from where you can find the format and reason for writing a sick leave letter.
Letter:
Dasun
Sampath Perera,
663/1,
Station Road,
Hunupitiya Wattala.
10 July 2012.
To
Mr.Dayarathne.
Head of the Team
Dear Dayarathne,I was feeling very tired and exhausted for the last two days and I consulted with a doctor today. He said that I am infected with jaundice and I need to take rest for two weeks. I write this letter to officially inform you about my sickness and to request for two weeks leave. I also have enclosed the medical report given by the doctor.