关于身体一直不佳的英文辞职信原因：近来身体一直不佳,无法在公司工作,特辞去现职,并在信中表示保证协助做好交接工作.

The Date
Employer’s Name
Name of Company
The address of the company
Dear Mr.or Ms.or employer’s name
I regret to inform you that due to my poor health that I am resigning from my job (job title goes here) and will no longer be able to continue to perform my duties at (Company Name.)
I am uncertain if you are aware that I have been ill for quite awhile.I have been advised by my doctor that I am no longer well enough to continue working,so after careful consideration I reached the decision that my resignation is the best conclusion for myself and for the company and will be effective (number of weeks here).
During this time I will make myself available to provide my assistance to any new personnel,and I will do everything that I can to make this transition go as smoothly as possible.
My time with (company name here) has been pleasant,and I thank you for hiring me for (name of job position here).I am deeply sorry for leaving the company under these circumstances.
I wish you much success with the company.
Sincerely,
Your name here (typed)
Your signature here