I might have anal cancer how do I tell my boss?

It's important. To tell your boss that you have a serious medical problem that is going to require a few months of treatment, but really is not their business to know the specifics, nor your obligation to talk about it with them or co-workers. This is why there is protected health care information. That means private.
Talk to your doctor. Why would you want to tell your boss that you "might" have anal cancer. Talk to your doctor to find out it you do and seek her/his advice.

Related Questions

How can you tell the difference between hemmerhoids and anal cancer?

See a doctor... For an exam. You cannot see the area to tell. Generally a hemorrhoid will be soft & raised & maybe slightly tender. Anal cancer would be more flat & firm and generally not sore. Anal cancer much more rare too. But needs an exam by a doctor to tell. Read more...

What anal conditions might predispose someone to anal cancer?

Many. Anal cancer risks include: HIV infection, multiple sexual partners, anal intercourse, cervical or vaginal cancer, smoking and low immunity. Also visit: http://www.Cancer.Org/cancer/analcancer/detailedguide/anal-cancer-risk-factors. Read more...
Various. Risk factors include: smoking, HIV infection, low immunity, cervical or vaginal cancer, anal intercourse. Visit for more details: http://www.Cancer.Org/cancer/analcancer/detailedguide/anal-cancer-risk-factors. Read more...