I am ________________, student of __________. My ID is _______________. I am writing this letter to inform you that I am suffering from stomach problem since last ________days. I really have a critical condition. As suggested by my doctor, I need to be admitted in the hospital for few days. For this I shall not be able to attend school. Kindly, grant me leave for a week. I shall be grateful to you in this regard. I have also attached the doctor's certificate along with this as a proof.
When I return on ___________, I fully intend to do my best to catch up on any work I missed during my absence. Please let me know if you need further verification from my doctor.
Your Sincerely,