Moodiness with Mirena and other IUDs: what the evidence shows

Moodiness with Mirena is something a lot of women describe after getting the hormonal IUD, but solid trial evidence that the device itself causes depression or mood swings is limited. Mirena releases a small, steady dose of the progestin levonorgestrel, mostly to the lining of the uterus. Some of that hormone reaches the bloodstream, though at lower levels than with the pill, an implant or a shot.

Most of the carefully controlled trial evidence on hormonal contraception and mood comes from combined pills, not IUDs. One randomized, placebo-controlled trial of a combined pill found small but statistically significant increases in anxiety, irritability and mood swing scores during the intermenstrual (hormone-taking) phase, alongside an improvement in premenstrual depression scores for the same group ( [2]). Whether that pattern carries over to a progestin-only IUD, which doesn't have a hormone-free week the way a pill does, hasn't been tested the same way.

Copper IUDs don't release any hormone at all. If you notice mood swings on a copper IUD, the device isn't changing your estrogen or progesterone levels. Your natural cycle is doing that on its own, the same way it would with no IUD in place ( [1], [4]). That distinction matters if you're trying to work out what's behind a bad week. Neither pattern tells you what will happen for you personally, since individual sensitivity varies more than the average result in any trial.

The honest answer is that scientists don't fully know why some people's mood shifts with hormonal birth control and others don't notice anything. What they do know is that estrogen and progesterone interact with brain chemistry, including serotonin signaling, and that some brains react more strongly to hormone change than others.

Research on PMDD points to a different brain sensitivity to normal hormone changes, not abnormal hormone levels overall (Schmidt et al., 1998, NEJM; Dubey et al., 2017, Molecular Psychiatry). A separate meta-analysis found lower luteal estradiol and other HPO-axis differences in some women with PMDD ( [1]). The hypothalamic-pituitary-ovarian axis, the signaling loop between the brain and ovaries, functions a little differently in some women with PMDD, including lower estradiol during the luteal phase in some studies ( [1]).

If you're sensitive to the hormone swings of your natural cycle, it follows that you might also be sensitive to a method that adds or changes hormones, whether that's a pill, an implant or a hormonal IUD. That sensitivity varies a lot from person to person, which is part of why trial results on mood and contraception are so mixed. That's also why one person's experience with Mirena, good or bad, doesn't predict another's.

If mood changes are going to show up with a new hormonal method, they usually show up in the first few months, while your body adjusts to a new, steadier hormone level. The one placebo-controlled pill trial that tracked mood directly followed women for three menstrual cycles and still found measurable differences in anxiety and irritability scores by the end of that time ( [2]), so a short trial period doesn't always settle the question.

There isn't a published trial that tracks mood with Mirena over time the same way, so there's no solid number to point to for IUDs specifically. In practice, doctors typically suggest giving a new method a few months before deciding whether it's working for you, and tracking your mood daily rather than relying on memory, since premenstrual mood patterns are easy to misjudge in hindsight.

If low mood, anxiety or irritability are still clearly worse than before the IUD after a few months, or they're affecting your relationships or your ability to function, that's a sign the IUD isn't the right fit rather than something to wait out. Keeping a simple daily log from day one makes that comparison much easier than trying to remember how you felt weeks ago.

Some women ask the opposite question: could an IUD help PMDD instead of causing problems? The idea is that suppressing ovulation might flatten the hormone swing that seems to bring on symptoms in a sensitive brain. In practice, evidence for hormonal IUDs specifically treating PMDD is limited, partly because a levonorgestrel IUD doesn't suppress ovulation for everyone the way a combined pill often does.

Guidelines point to other options with stronger evidence behind them for PMDD: SSRIs, which can work even when taken only during the luteal phase, certain combined hormonal contraceptives, and cognitive behavioral therapy. A doctor is the one to weigh these against your history, what you've already tried and whether you also want contraception.

For a closer look at the research specifically on IUDs, see IUDs for PMDD: does it work? and IUDs for PMS: does it work?. If a combined pill is what you're weighing instead, that's a separate research picture worth reading on its own. Either way, the decision usually comes down to your symptom pattern and what you and your doctor have already ruled out.

If you think your mood changed after getting a hormonal IUD, start by tracking it. A daily record, like a DRSP chart, shows whether your low mood or irritability lines up with your cycle, stays steady all month, or started right when the IUD went in. Two cycles of notes gives your doctor something concrete to look at, instead of a memory of one bad week.

From there, your options generally include switching to a copper IUD if you want contraception without added hormones, having the hormonal IUD removed if the timing and symptoms clearly line up, or treating the mood symptoms directly, such as with an SSRI or therapy, while you decide whether to keep the device.

For general guidance on what helps premenstrual mood symptoms, start with PMS treatment: what actually helps. For a broader picture of hormonal contraception and mood beyond IUDs, birth control and mood: what the evidence shows covers that ground.

If you want somewhere to put the feeling in the moment, before you decide anything, Niyora is a PMS and PMDD support app. Its Moon feature lets you write down what happened, see it from another angle and calm yourself before you react.