It often starts gradually. You suddenly feel more irritable than usual, even though nothing in your life has changed. At night you wake up at three in the morning and cannot find your way back to sleep. A vague anxiety you cannot pin down sits on your chest in the morning. And all of this happens even though your period is still coming, perhaps a little more irregularly, but it is there. This is exactly where the trap lies: because menstruation continues, many women and even many doctors think of hormones last. The verdict is then: "It is just stress." Or: "At your age, that is just how it is."
This article is about the phase that even many educational texts skip over: perimenopause. The transitional phase before menopause itself, which can stretch over years and during which the hormones do not decline steadily but ride a rollercoaster. We look at why fluctuating estrogen affects mood so strongly, how you can make patterns visible over months, and above all how to distinguish a hormone-related mood dip from a true depression that needs different treatment.
What is perimenopause, and why does it feel so chaotic?
Three terms are often mixed up, even though they mean very different things. Menopause in the medical sense is just a single day: the point at which the last menstrual period is twelve months in the past. Everything before that, when hormone production is already changing but the period is still coming, is perimenopause. And everything after it is postmenopause, the phase in which hormones remain at a low level and the body adjusts over the long term to its new state. For mood, it is the middle phase, perimenopause, that is the trickiest, and that is exactly the one that gets overlooked most often.
Perimenopause begins for many women in their mid to late 40s, occasionally as early as the early 40s, and can last four to ten years. The UK's NHS describes this transitional period as a phase in which physical and psychological symptoms can appear long before periods stop completely (see NHS: Menopause and perimenopause).
Perimenopause, menopause, postmenopause
The decisive point for mood: during perimenopause, estrogen does not simply drop slowly. It fluctuates. Sometimes the level is higher than during the fertile years, then it falls steeply, rises again, falls once more. This unpredictability is the reason the phase feels so chaotic, often more chaotic than later menopause, when the hormones settle at a low level.
Estrogen is far more than a reproductive hormone. In the brain it influences, among other things, the availability of serotonin and the sensitivity of serotonin receptors, which is precisely the system that many antidepressants also target. When the estrogen level drops sharply within a few days, it can feel like a sudden mood crash with no recognizable external trigger. On top of that, estrogen affects sleep, body temperature and the stress system. A bad night caused by night-time hot flushes increases irritability the next day, and poor sleep weighs on mood independently of that, as we described in detail elsewhere (see How sleep affects your mood).
Typical symptom clusters of perimenopause
Why is the hormonal cause overlooked so often?
There are several reasons why perimenopause in particular is underestimated as a cause of mood problems. The first is the ongoing cycle. As long as the period keeps coming, the common image of "the change" does not fit for many people, who associate it more with periods stopping. The second reason is the timing in life: the early to mid-40s often bring together parents who need care, growing children and pressure at work. It is tempting to put everything down to life circumstances. And the third reason is that the psychological symptoms are often more prominent than the physical ones. Someone who mainly struggles with irritability, rumination and anxiety, and who does not (yet) have pronounced hot flushes, is more likely to land at a diagnosis of "stress" or "low mood" than at the hormones.
The problem with this misreading is not only that women feel misunderstood. It can also mean that the actual cause is never raised, and that treatment options aimed specifically at the hormonal component go unused. This is exactly why it is so valuable to gather your own observations over a longer period, rather than relying on the memory of a single bad day in the consulting room.
Anyone who wants to understand the connection between hormones and mood more fully in general will find a good starting point in our article on Mood and the menstrual cycle. Many of the mechanisms described there for the monthly cycle apply in perimenopause in a more intense and more irregular form.
Is this the menopause or a depression?
This is perhaps the most important question in this article, and at the same time the one you should not answer alone or through an app. Even so, it helps to know the differences in order to prepare the conversation with your doctor.
A hormone-related mood dip in perimenopause is typically fluctuating and tied to patterns. It comes in waves, often in particular phases of the cycle, and between the lows there are clearly better days on which you feel like yourself. Irritability and inner restlessness are often to the fore, frequently accompanied by physical signs such as hot flushes, sleep problems or a more irregular cycle.
A clinical depression, by contrast, is more persistent. It lasts most of the day, on most days, for at least two weeks, and knows fewer of the brief windows of recovery. It is characterized by a consistently low mood, the loss of joy and interest in things that used to matter to you (the technical term is anhedonia), a markedly altered sense of self-worth, hopelessness and, in severe cases, thoughts of no longer wanting to live. Symptoms like these are never "just the hormones." They belong in professional hands, regardless of whether perimenopause is a trigger or not.
Important: both can exist at the same time. The hormonal transition is a known risk factor for depressive episodes, especially in women who have previously had a depression or pronounced premenstrual syndrome. And this raised risk is well documented: in the Harvard Study of Moods and Cycles, women with no prior depression who entered perimenopause developed clear depressive symptoms about twice as often as women who remained premenopausal (see Cohen et al., 2006, Archives of General Psychiatry). The large long-term study SWAN points in the same direction: during perimenopause and early postmenopause, the risk of a depressive episode was roughly two to four times higher than in the premenopausal phase, independent of previous depression and stressful life events (see Bromberger et al., 2011, SWAN). These figures come from study populations and say nothing about the individual case, but they make clear that this is not imagination.
The official menopause guideline from the UK institute NICE therefore explicitly recommends taking low mood related to menopause seriously and treating it in a differentiated way (see NICE: Menopause guideline).
If you suspect it could be more than a hormonal wave, do not wait. Seek medical or psychotherapeutic support. Tracking does not replace this assessment, it can only prepare for it and make the conversation more concrete.
When to see a professional
- When your low mood persists most of the day, on most days, for at least two weeks, with no clear better windows in between.
- When joy and interest are lost in things that used to matter to you (anhedonia).
- With persistent hopelessness or a markedly altered sense of self-worth.
- When the symptoms clearly interfere with your daily life, your work or your relationships.
- If you have thoughts of no longer wanting to live, get help right away. In the US, call or text 988 (Suicide and Crisis Lifeline). In the UK and Ireland, call Samaritans free on 116 123, available around the clock. In an emergency, call your local emergency number (112 in Europe).
Symptoms like these are never "just the hormones." Physical menopausal complaints should additionally be assessed by a gynecologist. Tracking can prepare the conversation but does not replace it.
How do you make the hormonal rollercoaster visible over months?
The treacherous thing about perimenopause is that the patterns stretch over weeks and months and are hard to grasp in everyday life. On a bad day we do not reliably remember how the past month went. This is exactly where structured self-tracking helps: it replaces the vague feeling "I have been worse lately" with a line you can actually follow.
Three things are worth recording. First, mood itself, ideally daily and with a low barrier, so that you keep it up. Second, the cycle, meaning the start and length of bleeding, because growing irregularity in particular is an important signal of perimenopause. And third, accompanying factors such as sleep quality, hot flushes, stress level or irritability. Only the combination of these layers makes connections visible, for example that your worst mood days regularly follow nights of poor sleep, or that a low takes shape before every period.
If your iPhone already stores cycle data in Apple Health, it is worth using a mood tracker that can draw on that data rather than keeping it separately. That way you do not have to record anything twice, and the patterns between cycle and mood appear in a single view. We describe in detail how to recognize and interpret such patterns in Recognizing mood patterns.
Schematic: estrogen fluctuation and mood over four months
What helps, beyond the hormone question?
The medical treatment of perimenopause, such as hormone replacement therapy, belongs in the hands of gynecology. For many women it can clearly ease both physical and psychological symptoms, but it is an individual judgement that cannot be replaced here. Talk about it openly with your gynecologist.
Alongside that, there are levers you can influence yourself and that demonstrably affect mood, not as a miracle cure, but as a solid foundation. Regular exercise, sufficient and protected sleep, dealing with stress and supportive social relationships are among them. Which of these factors actually have an antidepressant effect and how strong the evidence is, we gathered in What actually acts as an antidepressant. Especially in a phase where much lies outside your control, it helps to know where you do have leverage.
And finally the point of self-compassion: if you are more irritable, thinner-skinned or more vulnerable in this phase, that is not a character flaw and not a failure. It is an understandable response to a real biological transition. Judging yourself for it only makes it harder. Understanding why it happens takes away part of the dread, and it is precisely this "understand why" that is the heart of what we care about.
If your symptoms appear strongly tied to your cycle and you suspect a pronounced premenstrual pattern, it is also worth looking at our page on InnerPulse for PMDD, because the transitions between premenstrual symptoms and perimenopausal mood dips can be fluid.
InnerPulse: mood and cycle in one place
InnerPulse is a mood-tracking app for iPhone made precisely for observations like these over months. You record your mood in a single tap and can, if you wish, link it to more than 100 factors, including sleep, stress, irritability and cycle data from Apple Health. Over the weeks this builds a picture that makes the hormonal rollercoaster visible, instead of leaving it to your memory. In addition, established clinical self-tests are available, which you can use as a measure over time.
Data protection matters to us here: InnerPulse works completely offline and stores everything exclusively locally on your device. Your very personal mood and cycle data never leave your iPhone. There is no subscription, just a fair one-time purchase. If you would like to start understanding your patterns, you will find all the details in the InnerPulse guide.
One last, clear note: InnerPulse is a tool for self-observation. It replaces neither a medical diagnosis nor therapy. Hormonal complaints during menopause should be assessed by a gynecologist, and at any sign of depression you should get medical or psychotherapeutic help. What the app can do is give you and the people treating you a better basis, not a replacement, but a preparation.
Further reading
- Mood and the menstrual cycle
- How sleep affects your mood
- What actually acts as an antidepressant
- Recognizing mood patterns
- InnerPulse for PMDD
- Study on depression risk: Cohen et al. (2006), Harvard Study of Moods and Cycles
- Long-term study SWAN: Bromberger et al. (2011)
- Guideline: NICE: Menopause guideline
- Background: NHS: Menopause and perimenopause