Starting a new pill and noticing your mood shift is more common than it is often acknowledged. A low that is hard to place, an irritability that feels out of character, or a flatness that was not there before. Synthetic hormones interact with the same pathways in your brain that regulate how you feel, and for some people that interaction is noticeable. If that has been your experience, it is worth understanding why.
How synthetic hormones can affect mood and why the experience varies
Oestrogen and progestogen are the two hormones that rise and fall naturally across your cycle, and they play a significant role in how you feel day to day. Hormonal contraception introduces synthetic versions of one or both of these, and for some people that change is noticeable. Not because the levels are wrong, but because a synthetic hormone can interact with your brain and body differently to the ones you produce naturally.1
Whether you feel that difference, and how much, varies a lot. If your mood already shifts around your cycle with PMS, or you have a history of depression, you may find you are more sensitive to hormonal methods. Your age and the brand of contraception can play a part too.
Which methods are most associated with mood changes?
For the combined pill, mood changes are one of the more commonly reported side effects. They often settle after a few months as your body adjusts, but if they do not, that is worth raising with your GP or a sexual health clinician rather than putting down to the pill being right for you.2
The progestogen-only pill, sometimes called the mini pill, can affect mood too. Low mood or depression that comes on after starting it is worth getting looked at sooner rather than later.
The hormonal IUS, the contraceptive implant and the contraceptive injection have all been associated with mood changes, though the evidence is less consistent across these methods than it is for the pill.4
When to speak to your GP or a sexual health clinic
If your mood has shifted since starting a hormonal method, you do not have to wait until something feels serious enough to mention. A scheduled appointment is not the only time to raise it, and you do not need to have a clear explanation ready. How your contraception is affecting how you feel is enough of a reason to get in touch.3
How to approach switching methods
If mood changes are affecting your day to day, switching formulation or method is a reasonable path and one your GP can support. You do not have to stay on something that is not working for you.
The copper IUD does not release hormones, so it does not carry the same risk of mood-related effects. It can make periods heavier and cramping more noticeable, which is worth knowing before you decide.8
Barrier methods and fertility awareness-based methods have no hormonal side effects, though they work differently to hormonal methods in terms of effectiveness. It is worth talking through the options so you have cover that works for you through any change.7
How you feel matters as part of any conversation about contraception, not just whether a method is working in the technical sense. If your current method is affecting your mood, asking for a review is completely reasonable.6