abnormal uterine bleeding
"I'm only writing this in response to the numerous complaints of bleeding for months after receiving the Depo shot. When I went in to get mine, after much research on my part (I'd been on the pill before and it completely did not work for me), I had been told about 5 times that the MOST COMMON side effect of this form on birth control is bleeding/spotting for up to a YEAR. I was given my options and understood the risks and side effects. So for people who are surprised or upset about this, maybe your provider was not clear enough or you yourself did not do enough research, but it is a very well known and common side effect. As with many things, you need to let your body get used to it."