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Why Adenomyosis Develops: Causes, Risk Factors, and Complications

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Last updated: December 03, 2025

Overview

Adenomyosis is a condition where the endometrial tissue grows into the uterine muscle, often leaving women wondering why it happens and what triggers it. However, medical science has not been able to figure this out. Though there are several theories regarding its development, the exact cause is still under the covers. These theories are important in the context of understanding the symptoms and eventually mapping a powerful treatment plan.

So, does adenomyosis cause pain? Or, can adenomyosis cause cancer? Let’s find answers to all these questions in this article, along with adenomyosis causes and symptoms.

What Causes Adenomyosis?

As mentioned earlier, the exact adenomyosis cause is still unknown; however, there are several different theories about its origin. These generally include:

Invasive Tissue Growth:

One of the leading causes refers that the endometrial cells of the uterus start to migrate and invade the muscular wall of the uterus. This invasion is most commonly considered a result of uterine boundary disruptions due to previous uterine surgeries such as C-sections, fibroid removal, or dilation and curettage (D&C). This disruption makes it easier for endometrial tissue to become weak and easy to penetrate.

Developmental Origins:

This theory relates to fetal development. That is, according to this theory, endometrial tissue is misplaced in the uterine muscles before birth and later grows in response to hormonal shifts during adulthood.

Uterine Inflammation Related to Childbirth:

Childbirth creates a great change in the uterus, including inflammation after birth, due to which the uterus undergoes a healing process. However, this inflammation can temporarily disrupt the normal separation between the endometrial lining and the uterus muscle. This weakened boundary can also allow the endometrial cells to enter the muscle layer.

Stem Cell Origins:

Some researchers also propose that adenomyosis is a bone marrow stem cell-originated disease. According to this, bone marrow stem cells can migrate to the uterus and transform into endometrial cells within the uterus's muscle wall. This accumulation over time leads to the development of adenomyosis.

Role of Hormones:

Many studies suggest that adenomyosis is a hormone-dependent condition, meaning endometrial tissue grows, thickens, and accumulates in response to circulating estrogen levels.

Risk Factors for Adenomyosis:

Although adenomyosis is a condition that can develop in any woman of reproductive age, certain risk factors can contribute more towards this condition. These risk factors are generally linked to the proposed causes of adenomyosis, such as:

  • Women undergone previous uterine surgery, such as C-section, fibroid removal, or D&C, have higher chances of developing adenomyosis than their counterparts.
  • Women with a bad history of childbirth healing and postpartum inflammation are more likely to get this condition, as this can be the origin of alterations in their uterine structure.
  • Middle age and adenomyosis are also deeply connected, as the women in their 40s and 50s undergo more hormonal changes.
  • High exposure to estrogen, whether due to fertility treatments or naturally, can lead to the overgrowth of endometrial tissues in the muscle wall.
  • Young women can also develop this condition due to other underlying reproductive issues; however, such cases are very rarely diagnosed.

Complications of Adenomyosis:

Though a uterine issue, adenomyosis can lead to several complications that can eventually complicate your life if not treated in time. Apart from the condition’s trademark symptoms, heavy bleeding and pelvic pain, the following different factors broaden health concerns and lifestyle limitations:

  • Long-term Anaemia: Heavy bleeding is a core cause of long-term anaemia in adenomyosis.
  • Lethargy/Lack of energy: Anaemia and decreased blood supply can lead to fatigue, dizziness and weakness.
  • Impact on the Lifestyle: The pain and heavy bleeding associated with adenomyosis can affect a woman's ability to carry out her day-to-day life, work, social occasions, physical activity, and daily routine.
  • Avoiding Activities: Due to anxiety over having a sudden bleed or unpredictable symptoms, many women avoid participating in activities they would normally attend or engage in.

When to See a Doctor:

Although early adenomyosis symptoms can be misunderstood as normal menstrual discomfort, differentiating them is important to seek timely medical help. In cases of structural uterine issues, like adenomyosis, early diagnosis and treatment should become your priority, as these can lead to long-term complications and infertility.

Be alert for these seemingly minor symptoms of adenomyosis and contact your doctor right away if they are present:

  • Ongoing and/or intense pelvic discomfort that does not respond well to traditional pain medication or over-the-counter methods for relieving pain
  • Excessive menstrual flow disrupts your day-to-day responsibilities, to provide you with a reduced quality of life
  • Signs of anaemia showing visibly (examples: tiredness, breathlessness, dizziness)

Conclusion:

In conclusion, we know that the exact adenomyosis cause is still a mystery, but its treatment is not, with well-supported theories and advanced treatment options. But one thing is clear about the condition, that it is a result of non-uniform estrogen escalation. Apart from this, we also know that some women have higher chances of developing adenomyosis than others, which is an important insight, as this can help prevent it. Although adenomyosis is a non-cancerous condition, it can still have an impact on quality of life. Therefore, seeking medical care is important, especially on time.

Common Questions Asked

What creates adenomyosis?

 

Unknown at this time; however, possible explanations include tissue invasion, hormones, postpartum inflammation, how the uterus develops, and the actions of stem cells.

Does adenomyosis lead to the development of cancer?

 

No. Adenomyosis is a benign condition; thus, it does not turn cancerous.

Does adenomyosis hurt?

 

Yes. Many women report having extreme cramps, pelvic pain and pressure associated with menstrual periods due to increased muscular thickening in the uterus.

Does adenomyosis increase with age or following pregnancy?

 

Yes. Post-pregnancy and postpartum healing may cause adenomyosis through tissue alterations.

Can younger women develop adenomyosis?

 

Yes. While it typically occurs most often in females aged 40-50, younger females may also be affected.

Have any links been established regarding pregnancy or childbirth and developing adenomyosis?

 

Yes. Evidence of tissue damage, swelling, and changes and alterations to the uterus caused during childbirth may also be responsible for the development of adenomyosis.

Are there connections between adenomyosis and heavy menstrual problems and symptoms?

 

Yes. In addition to heavy bleeding and longer-lasting periods, increasing discomfort while on small amounts of blood since the endometrial lining has a thicker-than-usual build-up in the uterus, etc.

Does diagnosis happen through testing procedures used to obtain images of the uterus?

 

Most of the time, yes. Techniques such as MRI and ultrasound are used to help identify the anatomical changes in the uterine wall.

What treatment options are available for adenomyosis caused by hormonal imbalance?

 

Treatment may include hormonal IUDs, birth control pills, progesterone therapy, or medications that lower estrogen levels.

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