Why have my regular periods become heavier?

Have you ever noticed that your once-regular period suddenly became much heavier? While menstrual flow can naturally vary from cycle to cycle, a significant or persistent change shouldn't be ignored.

A regular menstrual cycle lasts between 21 and 35 days (or 21–45 days during adolescence) and usually varies by no more than five days from month to month.

One of our readers shared her experience:

"I'm 26 years old. My periods used to be much lighter, but about six months ago they suddenly became very heavy. For the first four days, I have to wear both a tampon and a pad, and sometimes I still leak. I even started wearing period underwear as extra protection. I visited a gynecologist, but I was told everything was normal. I don't feel convinced, so I'm trying to understand what could be causing this."

To help answer this important question, we spoke with Dr. Laura Kronlachner, obstetrician-gynecologist, endobiogenics specialist, and certified women's neurophysiology coach.

Common Causes of Heavy Menstrual Bleeding

Heavy menstrual bleeding generally falls into two main categories:

1. Structural causes — physical changes within the uterus that can usually be identified with a gynecological ultrasound.
2. Functional causes — when no structural abnormalities are found, but hormonal or other physiological factors affect the menstrual cycle.

Common Structural Causes

• Uterine polyps.
• Fibroids.
• Adenomyosis.
• Endometrial hyperplasia.

Possible Functional Causes

• Estrogen dominance.
• Progesterone deficiency.
• Hypothyroidism.
• Iron deficiency caused by prolonged heavy bleeding.
• Use of anticoagulant medications.
• Copper intrauterine device (IUD).

When Should You See a Doctor?

If your menstrual bleeding suddenly becomes significantly heavier or changes without an obvious reason, it's important to consult a healthcare professional to rule out structural conditions.

Your doctor may recommend additional investigations such as:

• Complete blood count and ferritin to check for anemia or iron deficiency.
• TSH testing to assess thyroid function.
• Hormone testing at the appropriate stage of the menstrual cycle.
• An endobiogenic consultation for a comprehensive evaluation of hormonal and nervous system function.

Identifying the underlying cause is essential for choosing the most appropriate treatment.

Supporting Healthy Estrogen Metabolism

One possible contributor to heavy menstrual bleeding is excess estrogen. Healthy liver and gut function play important roles in processing and eliminating estrogen from the body.

Strategies that may support healthy estrogen metabolism include:

• Using liver-supporting supplements containing milk thistle, dandelion, or artichoke.
• Supporting gut health with high-quality probiotics and prebiotic-rich foods.
• Eating enough dietary fiber (approximately 25–35 g per day).
• Limiting or avoiding alcohol.

Reducing Exposure to Xenoestrogens

Xenoestrogens are environmental chemicals that can mimic estrogen by binding to estrogen receptors in the body.

Common sources include:

• Cosmetics containing parabens or benzophenone.
• Plastic products containing bisphenol A (BPA) or phthalates.
• Food exposed to pesticides, herbicides, or artificial colorants.
• Low-quality menstrual hygiene products.
• Conventional household cleaning products.

Reducing exposure where possible may help support hormonal balance.

Lowering Inflammation Naturally

Inflammation may contribute to heavier menstrual bleeding. While ibuprofen has been shown to reduce menstrual blood loss for some women, lifestyle measures may also help lower inflammatory activity over time.

Healthy habits that may help include:

• Limiting dairy products if they worsen symptoms.
• Exercising regularly.
• Maintaining stable blood sugar levels.
• Using curcumin (turmeric) supplements with piperine, if appropriate.

The Bottom Line

Heavy menstrual bleeding is not always "just normal," especially if it represents a sudden change from your usual cycle.

Seeking medical evaluation is the first step toward identifying whether the cause is structural or functional. From there, targeted treatment and healthy lifestyle strategies can help improve both symptoms and long-term well-being.