If your period feels like it’s getting heavier, more painful, more draining, or harder to cope with each month — you are not imagining it.

Many women are told that painful periods are “just part of being a woman,” or that heavy bleeding is a normal part of perimenopause.

But periods that leave you exhausted, doubled over in pain, bleeding through clothes, cancelling plans, or worrying about where the nearest bathroom is are often a sign that something deeper is going on.

Heavy or painful periods can be linked to:

• hormonal imbalances
• endometriosis or adenomyosis
• fibroids
• perimenopause
• iron deficiency
• or cycles where ovulation is not occurring properly

And the important part: these symptoms often worsen over time if the underlying cause is not addressed.

What Is Considered a Heavy or Painful Period?

Understanding what’s considered medically “heavy” or “abnormal” is an important first step.

Heavy menstrual bleeding (menorrhagia)

Clinically, heavy menstrual bleeding is defined as:

• blood loss greater than ~80 mL per cycle
• bleeding lasting longer than 7 days
• or bleeding that interferes with daily life

In practice, this often looks like:

• needing to change a pad or tampon every 1–2 hours
• passing large clots
• “flooding” or bleeding through clothing or bedding
• using a tampon and a pad or a menstrual cup and period undies
• feeling fatigued, lightheaded, or depleted during your period

Research has shown that heavy menstrual bleeding is one of the most common gynaecological complaints and is strongly associated with reduced quality of life and iron deficiency anaemia (Fraser et al., 2007; Munro et al., 2011).

Painful periods (dysmenorrhoea)

Painful periods are typically described as:

• cramping pain in the lower abdomen
• pain that radiates to the back or thighs
• nausea, diarrhoea, or fatigue during menstruation

However, significant or worsening pain is not something to ignore, as it may indicate an underlying condition such as endometriosis or adenomyosis.

When Heavy or Painful Periods May Not Be Normal

While some variation in menstrual flow and discomfort is common, periods that are progressively worsening, cause significant fatigue, interfere with daily life, or require very frequent pad, tampon, or cup changes deserve further investigation.

You can read more about what’s considered a normal menstrual cycle here.

Common Causes of Heavy and Painful Periods

Heavy and painful periods can happen for several different reasons. In some women, hormones are the main driver. In others, inflammation, structural changes within the uterus, or perimenopause may be contributing factors.

From a clinical perspective, in primary dysmenorrhoea elevated prostaglandins drives period pain. Prostaglandins are inflammatory compounds that increase uterine contractions. Higher levels are associated with more severe pain and can also contribute to heavier bleeding (Dawood, 2006).

Hormonal Imbalance and Low Progesterone

Low progesterone is one of the most common causes of heavy bleeding. If you do not ovulate your progesterone remains low.

When progesterone is lower relative to oestrogen (in the luteal phase), the uterine lining may become thicker and less stable, which contributes to:

• heavier bleeding
• clotting
• irregular cycles
• worsening PMS
• increased period pain

This pattern is especially common during stressful life phases, PCOS PMOS, and perimenopause.

Endometriosis

Endometriosis is a chronic inflammatory and immune condition commonly associated with:

• significant period pain
• pain before bleeding starts
• pain with bowel motions or intercourse
• fatigue or digestive symptoms around menstruation

Pain that worsens over time or interferes with daily life should not be dismissed as “normal.”

If you are wondering whether you may have endometriosis read my guide on how to get an endometriosis diagnosis in New Zealand.

Adenomyosis

Adenomyosis is a common but often overlooked cause of:

• heavy bleeding
• severe cramping
• clotting
• pelvic pressure

Many women notice their periods become progressively heavier and more painful in their 30s and 40s.

Fibroids and Polyps

Fibroids and uterine polyps are structural changes that can contribute to:

• heavy bleeding
• clotting
• pelvic pressure
• prolonged periods

Perimenopause

Hormonal fluctuations during perimenopause can contribute to:

• heavier bleeding
• shorter cycles
• clotting
• worsening PMS
• increased period pain

Importantly, these changes can begin years before menopause itself.

Iron Deficiency

Heavy periods and iron deficiency often occur together.

Over time, ongoing blood loss can contribute to:

• fatigue
• dizziness
• poor exercise tolerance
• feeling depleted during menstruation

This is why iron studies are often an important part of investigating heavy periods.

Copper IUD

Copper IUDs can increase bleeding and cramping in some women, particularly in the first 6–12 months after insertion.

Other Medical Causes

Less commonly, heavy or painful periods may be linked to:

• thyroid dysfunction
• clotting (coagulation) disorders
• pelvic infections
• certain medications

If bleeding is sudden, severe, or significantly different from your usual cycle, medical assessment is important.

When Should You Investigate Heavy or Painful Periods?

While some variation in menstrual flow and discomfort is common, there are clear signs that your period may need further investigation.

In clinical practice, the key question is not just “is this happening?” – but:

“Is this getting worse, interfering with your life, or not responding to support?”

You should consider further investigation if you experience:

• bleeding that is becoming progressively heavier over time
• needing to change pads or tampons every 1–2 hours
• passing large or frequent clots
• periods lasting longer than 7 days
• pain that interferes with work, sleep, or daily activities
• symptoms such as fatigue, dizziness, or shortness of breath
• cycles that are becoming shorter, longer, or more irregular
• bleeding between periods or after intercourse

Clinical guidelines use these features to help identify abnormal uterine bleeding (AUB) and warrant further assessment (Munro et al., 2011).

Why early investigation matters

Many causes of heavy and painful periods are progressive, which means they tend to get worse over time if they are not addressed.

For example:

• untreated hormonal imbalances can lead to increasingly heavy bleeding
• inflammatory conditions like endometriosis may progress
• ongoing heavy bleeding can contribute to anaemia and fatigue

Early assessment allows for:

• clearer identification of the underlying cause
• more effective and targeted treatment
• prevention of longer-term complications

How Are Heavy or Painful Periods Investigated in New Zealand?

The right investigations depend on your symptoms, age, and cycle pattern, but may include:

• blood tests (especially iron studies)
• hormone testing
• pelvic ultrasound
• further assessment for conditions such as endometriosis or adenomyosis

In New Zealand, this usually begins through your GP, although you can arrange some tests privately.

When to Seek Support

If your period affects your energy, family life, work, relationships, or overall wellbeing, it’s worth seeking support – even if your symptoms have been present for years or you’ve been told it is normal.

Many women are told that painful or heavy periods are simply something they need to “put up with.” But in many cases, these symptoms are a sign that something deeper is going on.

A more holistic and investigative approach may help uncover contributing factors such as hormonal imbalance, inflammation, ovulatory dysfunction, iron deficiency, or underlying conditions like endometriosis or adenomyosis.

By looking at your symptoms, cycle patterns, lifestyle, and appropriate testing together, it’s often possible to create a clearer picture of what may be driving your symptoms and what support may help.

As an experienced New Zealand naturopath I work with women who are looking for a natural and personalised approach to heavy or painful periods, you can learn more about my approach and how to work with me here.

Kia ora, I’m Anna Jolly

I’m a degree-qualified naturopath and medical herbalist based in Aotearoa / New Zealand with a focus on women’s hormones, fertility and menstrual health.

Through Anna Naturally, I combine evidence-informed practice with traditional herbal medicine and a root-cause approach to help women better understand their bodies and create sustainable changes that fit real life.

Meet Anna and learn more about my approach.
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Common Questions About Heavy and Painful Periods