That really depends on the person. Not all women can do long-term skipping successfully; however, to my knowledge no conclusive evidence exists to show that long-term skipping is dangerous.
In fact, doctors often recommend continuous HBC use (never having periods) to women suffering from endometriosis or other disorders that cause extremely difficult periods; and there's a new kind of HBC in the works that's marketed as being used to stop all periods. You can read about it in a very interesting article here (http://www.macleans.ca/topstories/health/article.jsp?content=20051213_117621_117621).
Of course, many women aren't comfortable with that idea (which is totally their right), and there's certainly the possibility that there are problems with long-term skipping that we're not aware of yet. But that's a start, anyway. :)
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In fact, doctors often recommend continuous HBC use (never having periods) to women suffering from endometriosis or other disorders that cause extremely difficult periods; and there's a new kind of HBC in the works that's marketed as being used to stop all periods. You can read about it in a very interesting article here (http://www.macleans.ca/topstories/health/article.jsp?content=20051213_117621_117621).
Of course, many women aren't comfortable with that idea (which is totally their right), and there's certainly the possibility that there are problems with long-term skipping that we're not aware of yet. But that's a start, anyway. :)