Menstrual cycle & mood: Why your emotions change throughout the month

Have you ever felt like a completely different person depending on where you are in your cycle?

Many women notice a familiar pattern; there are weeks where everything feels manageable, evening One week, you feel energised, focused, and emotionally resilient. The next, motivation dips, emotions feel heavier, and even small challenges seem harder to navigate.

It can feel unpredictable, particularly when mood and energy shift without any obvious external cause.

If this sounds familiar, you’re not imagining it.

These changes are often linked to the natural hormonal fluctuations that occur throughout the menstrual cycle. While many people associate the menstrual cycle solely with reproduction, its effects extend far beyond the ovaries. Hormonal changes influence the brain, nervous system, energy levels, cognition, and emotional wellbeing.

Understanding how your cycle affects mood can help you make sense of these shifts and approach them with greater awareness and self-compassion.

The menstrual cycle is more than a reproductive process

The menstrual cycle is regulated by a complex interaction of hormones, including oestrogen and progesterone, coordinated through the hypothalamus, pituitary gland and ovaries.¹

While it’s often described as a series of distinct stages, biologically the cycle is made up of two main phases: the follicular phase and the luteal phase. These are sometimes broken down further into menstrual, ovulatory, and post-ovulatory stages to make them easier to understand.

Importantly, these hormonal shifts don’t just affect the reproductive system, they also influence the brain, including areas involved in mood, cognition and emotional regulation.

How hormones shape mood throughout your cycle

Oestrogen and progesterone interact with neurotransmitters such as serotonin and GABA, which play key roles in mood and emotional stability. As these hormones rise and fall throughout the cycle, they can subtly, and sometimes significantly, influence how you feel.

For many women, this might feel like having more energy and clarity at certain times of the month and increased sensitivity or emotional reactivity at others. Research suggests that these changes are not simply psychological, but reflect the brain’s response to hormonal fluctuations across the cycle.²

The follicular phase: Rising energy & improved mood

The follicular phase begins on the first day of menstruation and continues until ovulation.

While this phase starts during your period, many people begin to notice improvements in energy and mood as it progresses. During this time, oestrogen levels gradually increase, and research has linked rising oestrogen levels with positive effects on mood, cognitive function, and overall wellbeing.

Many women describe the follicular phase as a time of:

Increased energy
Clearer thinking
Improved motivation
Greater emotional stability
Enhanced productivity

Although every experience is unique, this phase is often associated with a gradual sense of renewal as the body moves away from the hormonal shifts of the previous cycle.

Ovulation: A natural peak

Ovulation marks the transition between the follicular and luteal phases and is characterised by a peak in oestrogen levels.³ At this point in the cycle, some women report feeling more energised, confident, or socially engaged. These changes may linked to the combined effects of oestrogen and small increases in androgens, which can influence motivation and mood.

As with all aspects of the cycle, experiences vary, but these shifts reflect measurable hormonal changes rather than random fluctuations.

The luteal phase: Why things feel different

After ovulation, the body enters the luteal phase. During this time, progesterone levels rise before both progesterone and oestrogen begin to decline if pregnancy does not occur.

It is this change in hormone levels, rather than the levels themselves, that appears to play an important role in mood symptoms. Research shows that many women experience increased emotional sensitivity, irritability, fatigue or low mood during the late luteal phase.⁴

For some, these changes are mild and manageable. For others, they can significantly affect daily life, relationships, and productivity.

Understanding that these experiences have a biological basis can help reduce self-criticism during this phase of the cycle.

When it’s more than PMS

For a smaller proportion of women, these cyclical changes are not just uncomfortable, they are significantly disruptive.

Premenstrual dysphoric disorder (PMDD) is a recognised condition involving severe emotional and psychological symptoms during the luteal phase, including depression, anxiety, irritability and mood instability.

Research suggests PMDD is not caused by abnormal hormone levels. Instead, individuals with PMDD appear to have an increased sensitivity to normal hormonal fluctuations, particularly within systems involving serotonin and GABA.

Symptoms typically emerge during the luteal phase and improve shortly after menstruation begins. More recent research has highlighted differences in how the brain processes hormonal changes in individuals with PMDD, particularly in regions involved in emotional regulation.⁵

If symptoms are severe or consistently disruptive, seeking professional support is important.

Why hormonal mood changes feel so personal

One of the most challenging aspects of cycle-related changes is how personal they can feel.

Because hormonal fluctuations influence brain chemistry, emotional processing, and stress responses, they can affect perception as well as mood.

This means that the same situation can feel manageable one week, and overwhelming the next, not because anything external has changed, but because your internal environment has shifted.

Understanding this distinction can be incredibly helpful.

Rather than viewing yourself as inconsistent, emotional, or overly sensitive, you can begin to recognise these experiences as part of a complex interaction between hormones and the brain.

How to support your mood throughout your cycle

While hormonal fluctuations are a normal part of the menstrual cycle, there are ways to support your wellbeing throughout the month:

Track your cycle

Many people find it helpful to track their cycle to identify patterns in mood, energy, and symptoms.

Apps such as Clue or Flo can provide valuable insights into how different phases of the cycle affect you personally.

Prioritise stress-management

The nervous system and hormonal system are closely connected.

Periods of sustained stress may amplify cyclical symptoms, particularly during the luteal phase. Finding ways to manage stress can therefore make a meaningful difference.

Helpful strategies include:

Regular exercise
Mindfulness or meditation
Time in nature
Breathwork
Adequate sleep
Setting realistic expectations during lower-energy phases

Consider nutritional & herbal support

Some individuals choose to include supportive herbs as part of their wellness routine.

Ashwagandha has been studied for its role in supporting the body’s response to stress, while Shatavari has a long history of traditional use in women’s health. As with any supplement, these options are not suitable for everyone, and professional guidance should be considered where appropriate.

Working with your cycle instead of against it

Many of us expect the same level of energy, motivation, and emotional capacity every day of the month.

However, the menstrual cycle is a dynamic biological rhythm, not a static state.

Rather than fighting against these natural fluctuations, it can be helpful to work alongside them.

This might mean:

Scheduling demanding tasks during higher-energy phases
Allowing more rest when energy naturally dips
Planning self-care during emotionally sensitive periods
Practising greater flexibility and self-compassion

The goal is not to control every aspect of your cycle but to better understand your body’s patterns and respond to them in a supportive way.

Ultimately working with your cycle is less about control, and more about awareness, recognising patterns and responding to them with a little more flexibility.

If this resonates, you may also enjoy Fuel your cycle: eating for every phase of your menstrual cycle and Adapting to stress with Ashwagandha

Any questions? Contact one of our Nutritional Therapists via live chat, weekdays from 8 am to 8 pm.