A medical leave letter is written when you'll be taking time off of work due to medical reasons.
If the letter is being sent as a hard copy, then it should be in the proper business format, otherwise, if the letter is being emailed, it should have an appropriate subject line and proper grammar.
Due to medical reasons, I am formally requesting a medical leave for 30 days. I plan to leave work on [Date Leaving] and return to work on [Date Returning].
During my absence, I will undergo major, non-elective surgery. This surgery will render me temporarily unable to perform the essential functions of my position. I will use a small portion of this leave time to organize important household business and prepare my family. The rest will be devoted to healing, resting, and fully recovering. I have enclosed a note from my doctor confirming my procedure.
In preparation for my absence, I will provided my team with files, information, and assistance as required. However, if there are questions or concerns regarding my work, I may be able to answer them by phone or e-mail. Please do not hesitate to contact me during this time.
Thank you for your consideration,