Side-effects such as nausea, vomiting, headaches, mood changes, changes in libido, weight gain, skin pigmentation, poor tolerance of contact lenses, vaginal candidiasis, gall-bladder disease, gastro-intestinal irritation, fluid retention, tightness and tenderness of the breasts may occur.

Which birth control causes weight gain?

One study showed that, over one year, women who used Depo-Provera gained five pounds more than those using a copper IUD. The reason Depo-Provera can cause weight gain, Dr. Stanwood explains, is that it can activate signals in the brain that control hunger.

Does Mirena cause weight gain?

Some people claim that Mirena causes weight gain, but the evidence for this is sparse. It isn't listed as a common side effect on the Mirena website. Anecdotal evidence for weight gain — that is, individual stories about gaining weight on the IUD — isn't very strong.