Premenstrual Syndrome (PMS): How to Recognise the Symptoms

Exhaustion, a bloated stomach, and a mood that seems to have a life of its own - all arriving like clockwork a week or so before your period. If any of this sounds familiar, you may be experiencing premenstrual syndrome, or PMS.

These symptoms can feel unpredictable, and because they vary from cycle to cycle, they're not always easy to anticipate or understand. But here's the thing: you are not destined to simply put up with PMS every single month. There is a lot that can genuinely help.

In this article, we walk you through how to recognise PMS symptoms, what's actually happening in your body during this phase of your cycle, when it's worth reaching out to your GP - and what evidence-backed, everyday strategies can support you in feeling more like yourself again.

What Is Premenstrual Syndrome (PMS)?

Premenstrual syndrome is a collection of physical and emotional symptoms that appear in the days leading up to a period and typically ease once it begins. PMS occurs during the luteal phase - the second half of your menstrual cycle, roughly from ovulation through to the start of your period. This is when oestrogen and progesterone rise and then begin to fall, setting off a cascade of physiological changes throughout the body.

According to the NHS and RCOG guidance, an estimated 3 in 4 women experience some form of PMS during their reproductive years [O'Brien & Bäckström, Lancet 2008]. For most, symptoms are manageable. For around 5-8%, they're significant enough to affect daily life - at work, in relationships, or in overall wellbeing [RCOG Green-top Guideline No.48].

PMS is not "just hormones" or something you simply need to push through. It's a recognised physiological condition, and understanding what's driving it is the first step to managing it more effectively.

Physical Symptoms of PMS

Physical symptoms are often the most immediately noticeable - and they can vary considerably from person to person, and even from cycle to cycle. The most commonly reported include:

Bloating and water retention

A feeling of puffiness or heaviness, particularly around the abdomen, hands, or face. This is driven by hormonal shifts - particularly the progesterone rise and subsequent fall - that affect how the body regulates fluid and sodium retention in the second half of the cycle.

Breast tenderness

Breasts may feel swollen, heavy, or sensitive to touch in the days before a period. This is one of the earliest and most consistent signs of PMS, driven primarily by the post-ovulatory rise in progesterone and, in some women, elevated prolactin levels during the luteal phase.

Fatigue

Not ordinary tiredness - but a deep, dragging exhaustion that doesn't always improve with sleep. During the luteal phase, the body's core temperature rises slightly, progesterone has a mildly sedating effect, and sleep architecture shifts - reducing restorative slow-wave sleep even when total sleep duration is unchanged. The result is a persistent sense of being unrefreshed.

Headaches and migraines

The sharp drop in oestrogen in the late luteal phase is a well-established trigger for hormonal headaches and, in susceptible women, full migraines - sometimes called menstrual migraines. These tend to be more intense and longer-lasting than typical tension headaches, and are directly linked to the rate and magnitude of the oestrogen decline rather than its absolute level.

Cramps and abdominal discomfort

Mild cramping can begin before the period even starts. This is driven by rising prostaglandin levels - specifically PGF2α and PGE2 - which trigger uterine smooth muscle contractions. Women with higher prostaglandin sensitivity tend to experience more severe cramping, and systemic low-grade inflammation (more on that below) raises prostaglandin production further.

Skin breakouts

The luteal phase brings a rise in progesterone that stimulates sebaceous gland activity and increases sebum production - often leading to spots or worsened acne in the days before a period. Testosterone fluctuations in this phase can compound the effect, which is particularly common in women with PCOS and androgen excess.

Digestive changes

Bloating, constipation, or looser stools are all frequently reported before periods. Progesterone slows gastrointestinal motility - its relaxing effect on smooth muscle extends well beyond the uterus. Prostaglandins also influence gut motility, which explains why digestive symptoms often peak precisely when cramping does.

Sleep disturbances

Difficulty falling asleep, waking through the night, or feeling unrefreshed despite a full night's rest are all common in the luteal phase. Oestrogen and progesterone both modulate core body temperature and influence melatonin regulation, and their combined fluctuations in the second half of the cycle meaningfully affect sleep quality - independent of stress or anxiety.

Emotional and Psychological Symptoms of PMS

For many women, the emotional symptoms of PMS are just as disruptive - if not more so - than the physical ones. And yes, those mood shifts and cravings are completely physiological - not a reflection of emotional fragility or a lack of willpower. They include:

• Irritability or a short fuse - feeling easily frustrated, snapping at people, or having a much lower tolerance for everyday stress
• Low mood - a general flatness or sadness that feels disproportionate and lifts almost immediately once the period begins
• Anxiety - heightened worry or a sense of unease that may feel out of character
• Tearfulness - crying more easily, often over things that wouldn't normally provoke a strong reaction
• Brain fog and poor concentration - difficulty staying on task, forgetting things, or struggling to think clearly
• Food cravings - particularly for sweet, salty, or carbohydrate-rich foods, driven by serotonin fluctuations and the body's attempt to self-regulate mood through blood sugar
• Feeling overwhelmed - a sense that everything is too much, which often lifts dramatically once the period arrives

These symptoms have a clear physiological basis. The drop in oestrogen in the late luteal phase affects the serotonergic system in two important ways: it reduces serotonin transporter (SERT) activity - meaning serotonin is cleared more quickly from synapses - and it lowers the density of serotonin receptor sites, blunting the system's overall responsiveness [Roca et al., Biol Psychiatry 2003]. This is why so many women notice they feel noticeably more like themselves within a day or two of their period starting - not because the situation changed, but because the neurochemical environment did.

There is also a second, lesser-known mechanism: allopregnanolone, a metabolite of progesterone, normally acts as a calming modulator of the GABA-A receptor system. In women with PMS and PMDD, the brain's sensitivity to allopregnanolone is paradoxically reduced in the luteal phase, meaning that even though progesterone is elevated, its calming effect on the nervous system is blunted [Bäckström et al., Steroids 2014]. This explains why emotional symptoms can feel most intense precisely when progesterone is at its highest - and why some women feel better only once progesterone begins to fall and the cycle resets.

What Causes PMS? The Physiological Picture

The precise interplay of factors behind PMS is still being actively researched - what we do understand clearly is the hormonal and physiological picture, and it's more nuanced than a simple "hormones go up and down."

After ovulation, oestrogen and progesterone rise in preparation for a potential pregnancy. When pregnancy doesn't occur, both hormones fall sharply in the days before the period. It's the rate and pattern of this withdrawal - particularly in the oestrogen drop - that affects neurotransmitter balance, fluid regulation, prostaglandin synthesis, and the nervous system's stress response.

Several other factors can intensify PMS symptoms significantly:

Chronic stress and the HPA axis

Elevated cortisol - the body's primary stress hormone - affects the hypothalamic-pituitary-ovarian (HPO) axis, reducing the amplitude of the mid-cycle LH surge and impairing the quality of the luteal phase. This can lead to relatively low progesterone production, deepening the oestrogen:progesterone imbalance that underlies PMS. Chronic stress is one of the most consistent aggravating factors in clinical practice.

Systemic low-grade inflammation

Women with more severe PMS show elevated inflammatory markers - including C-reactive protein (CRP) and interleukin-6 (IL-6) - specifically in the luteal phase [Bertone-Johnson et al., J Womens Health 2014]. This matters because inflammation directly stimulates prostaglandin production - connecting inflammatory status to the physical symptoms of cramping, bloating, and breast tenderness. An anti-inflammatory diet, omega-3s, and magnesium all work in part through this inflammatory pathway.

Insulin resistance and blood sugar dysregulation

This is particularly relevant for women with PCOS. Elevated insulin stimulates ovarian androgen production, which in turn suppresses progesterone synthesis - deepening the hormonal imbalance at the core of PMS. Blood sugar instability also drives the serotonin fluctuations responsible for mood symptoms and cravings, creating a physiological feedback loop that amplifies almost every PMS symptom.

Nutritional status

Low levels of magnesium, vitamin B6, vitamin D, and calcium are all independently associated with more severe PMS symptoms. Many UK women are below optimal intake for several of these simultaneously - often without realising it.

Underlying hormonal imbalances

Women with PCOS, endometriosis, thyroid conditions, or adenomyosis consistently report more pronounced premenstrual symptoms. If you have one of these conditions, addressing the underlying hormonal picture - not just managing PMS symptoms - will produce more lasting results.

PMS or PMDD? Knowing the Difference

If your premenstrual symptoms are significantly affecting your ability to function - at work, in your relationships, or in your daily life - it's worth being aware of premenstrual dysphoric disorder (PMDD).

PMDD is a more severe and physiologically distinct condition that affects roughly 3-8% of women in their reproductive years [Halbreich et al., Psychoneuroendocrinology 2003]. The key difference from PMS isn't simply intensity - it's the nature and cyclical precision of the psychological symptoms: extreme mood shifts, severe irritability, debilitating anxiety, or feelings of hopelessness that appear specifically in the luteal phase and resolve clearly within a few days of the period beginning.

PMDD is formally recognised by the NHS and classified in the DSM-5 as a depressive disorder in its own right. If this resonates with you, please do reach out to your GP. Effective support - including specialist referral, evidence-based supplementation, and medical treatment where appropriate - is available. You don't need to navigate it alone.

How to Track Your Symptoms

One of the most practical things you can do is start logging your symptoms consistently over two to three cycles. This helps confirm whether what you're experiencing is genuinely cyclical, identifies patterns you might not otherwise notice, and gives both you and your GP a much clearer picture if you decide to seek support.

Cycle-tracking apps make this straightforward. Popular options in the UK include:

• Flo - logs symptoms, mood, energy, and physical signs day by day and highlights patterns over time; useful even if your cycles aren't regular
• Clue - science-led, with strong symptom tracking and cycle phase analysis across multiple cycles
• Natural Cycles - particularly useful if you're also measuring your basal body temperature, which gives a more precise picture of ovulation timing and the start of your luteal phase

Over time, these apps help you identify not just your period date, but your likely ovulation window and when your luteal phase is likely to begin - so you can put supportive strategies in place before symptoms peak, rather than reacting to them once they've already arrived.

If you have PCOS and irregular cycles, tracking symptom patterns rather than calendar dates becomes especially important, since the luteal phase may begin at different points each cycle.

Evidence-Backed Ways to Support Yourself Through PMS

We know the list of strategies can feel like a lot - the key is identifying what's most relevant to your symptoms and starting there, rather than trying to do everything at once. Here's what the evidence actually supports.

Eat to support hormonal and blood sugar balance

Focus on blood sugar stability throughout the second half of your cycle. Eating regularly, prioritising protein and fibre at each meal, and reducing refined sugars and ultra-processed foods all help moderate the hormonal fluctuations and serotonin swings that drive PMS symptoms. This is especially relevant if insulin resistance is part of your picture - stable blood sugar directly supports the oestrogen:progesterone balance. Explore our nutrition guide for hormonal balance.

Specific nutrients with strong evidence for PMS support:

• Magnesium - Found in dark leafy greens, pumpkin seeds, cashews, and dark chocolate. Magnesium competes with calcium at the smooth muscle receptor level, reducing prostaglandin-driven uterine contractions and easing cramping. Clinical trials also show meaningful reductions in fluid retention and mood symptoms [Walker et al., J Womens Health 1998]. Many women in the UK are below optimal levels without realising it.
• Calcium - Perhaps the most evidenced single nutrient for PMS. A landmark RCT found that 1,200 mg/day of calcium reduced total PMS symptom scores by approximately 48% compared to placebo across four menstrual cycles [Thys-Jacobs et al., Am J Obstet Gynecol 1998]. Dietary sources include dairy, fortified plant milks, tahini, and tinned sardines with bones.
• Vitamin B6 - A key cofactor in serotonin and dopamine synthesis. A BMJ meta-analysis of nine RCTs found that B6 supplementation (up to 100 mg/day) significantly reduced the emotional symptoms of PMS - irritability, low mood, and anxiety - compared to placebo [Wyatt et al., BMJ 1999].
• Vitamin D - A large prospective study found that women with the highest dietary Vitamin D intake had a 41% lower risk of developing PMS compared to those with the lowest intake [Bertone-Johnson et al., Arch Intern Med 2005]. Vitamin D modulates serotonin synthesis genes and has direct anti-inflammatory effects on prostaglandin pathways. Given the UK's limited sunshine months, supplementation is particularly worth considering - the NHS recommends 10 mcg (400 IU) daily from October to March.
• Omega-3 fatty acids - Found in oily fish (salmon, mackerel, sardines) and flaxseed. Omega-3s reduce upstream inflammatory signalling and lower prostaglandin synthesis, easing cramping and supporting mood stability [Rahbar et al., Reprod Health 2012].

Reducing caffeine and alcohol - particularly in the week before your period - also makes a meaningful difference to anxiety levels, sleep quality, and fluid retention.

Discover our Magnesium Bisglycinate, designed to support stress relief, improve sleep quality and help reduce fatigue.

Move your body in a way that feels good

Regular movement throughout the cycle supports progesterone production, helps regulate cortisol, and boosts endorphins. In the premenstrual phase specifically, lower-intensity exercise tends to be more physiologically supportive than high-intensity training - which can raise cortisol further in an already-stressed system. Walking, yoga, Pilates, and swimming all work with your hormonal state during this phase rather than against it.

Protect your sleep and stress response

Sleep and PMS exist in a physiological feedback loop: poor sleep elevates cortisol, which suppresses progesterone and deepens hormonal imbalance; and hormonal imbalance affects sleep quality. A consistent bedtime routine, limiting screens and alcohol before bed, and protecting time for genuine rest all help break this cycle. Stress management practices - breathwork, mindfulness, journalling, or simply building in transition time between work and wind-down - are equally important for maintaining the HPA axis balance that underpins a healthy luteal phase.

Consider targeted supplementation

We know the supplement landscape can feel overwhelming. Here is what has genuinely meaningful clinical evidence for PMS - and why it works physiologically:

• Saffron - Multiple randomised controlled trials have found saffron extract to be comparable to low-dose SSRIs for mood-related PMS symptoms, with a significantly better tolerability profile [Kashani et al., Human Psychopharmacology 2017; Agha-Hosseini et al., BJOG 2008]. It also supports sleep quality and menstrual cycle comfort. Read our full article on saffron for PMS.
• Ashwagandha - A well-researched adaptogen that has been shown to significantly lower cortisol levels and reduce perceived stress, anxiety, and fatigue - all of which are compounded in the premenstrual phase [Chandrasekhar et al., Indian J Psychol Med 2012]. Its mechanism acts directly on the HPA axis.
• Griffonia (5-HTP) - A natural and direct precursor to serotonin, griffonia provides upstream substrate support for a neurotransmitter system that is functionally compromised during PMS. Particularly relevant given the serotonergic mechanism outlined above.
• Vitamin B6 (as P5P) - In its active pyridoxal-5-phosphate form, B6 is the rate-limiting cofactor in serotonin and dopamine synthesis, and also supports progesterone production in the luteal phase. The active form (P5P) bypasses the conversion step required for standard B6, making it more bioavailable.
• Magnesium bisglycinate - The bisglycinate form offers superior absorption compared to magnesium oxide, with a lower risk of digestive discomfort. It supports muscular relaxation, sleep quality, and - through its anti-inflammatory action - reduction of prostaglandin-driven cramping and fluid retention. Discover SOVA's Magnesium Bisglycinate.

SOVA's Serenity Booster brings the mood and nervous system support together in a single formula - combining saffron, ashwagandha, griffonia, and vitamin B5 - specifically developed to support emotional balance, ease the stress response, and improve sleep quality around the luteal phase. It's recommended by gynaecologists and endocrinologists, and formulated to clinical-grade standards.

If your PMS is connected to a broader hormonal imbalance - irregular cycles, acne, fatigue, or suspected PCOS - Ovastart works at the physiological root. With a clinical dose of Myo and D-Chiro Inositol, active B vitamins (including P5P and Quatrefolic® B9), and zinc bisglycinate, it supports regular ovulation, reduces androgen excess, and improves the luteal phase quality that underpins PMS severity. Explore our full guide to PCOS supplements.

Discover Ovastart, our inositol-based supplement designed for women with PCOS.

Not sure where to start? Take the free SOVA quiz for a personalised recommendation based on your cycle, symptoms, and health history.

When to Reach Out to Your GP

You know your body. If something feels consistently off each cycle - if PMS is costing you days, relationships, or your sense of self - that deserves to be taken seriously. It's worth reaching out to your GP if any of the following apply:

• Symptoms are severe enough to affect your work, relationships, or quality of life
• You suspect PMDD (see the section above)
• Symptoms appear throughout your entire cycle rather than only in the luteal phase - this may indicate a different underlying cause worth investigating
• You have PCOS, endometriosis, a thyroid condition, or another hormonal imbalance that may be contributing to your symptoms
• You've made consistent lifestyle and nutritional changes for three full cycles without meaningful improvement

Your GP can arrange hormonal blood tests, refer you to a gynaecologist or specialist in hormonal health, and discuss the full range of options - from nutritional support through to hormonal and non-hormonal medical treatment. The RCOG Green-top Guideline on PMS (No.48) provides the evidence-based framework your GP will use, and it's worth knowing it exists if you need to advocate for yourself in that conversation.

What This Means for You

PMS is common - but common doesn't mean inevitable. With a clearer understanding of the physiology behind it, consistent support across nutrition, movement, sleep, and the right supplementation, most women experience a real and lasting improvement in their premenstrual symptoms over time.

The key is consistency and relevance: identify the strategies that address your specific symptom pattern, build them in gradually, and give your body two or three cycles to respond. Small, physiologically-informed changes add up in ways that a single-supplement approach rarely does.

If PCOS is part of your picture, supporting your hormonal health more broadly will have a direct and meaningful impact on how your luteal phase feels. Explore our hormonal balance collection or read more in The PCOS Bible to understand where your symptoms fit and what supports them best.

You don't have to just put up with it. 💜

This article is for informational purposes only and does not constitute medical advice. Always consult your GP or a qualified healthcare professional before starting a new supplement, particularly if you are pregnant, breastfeeding, or taking any medication. The scientific references cited are provided for transparency and further reading.