Endometriosis vs Adenomyosis: Key Differences Every Woman Should Know

By Dr. Ria Katwala Solanki, Laparoscopic Gynaecologist and Endometriosis Specialist, Mumbai

Period pain is common, but pain that disrupts your work, sleep or relationships is not normal. Two conditions are often behind this kind of pain: endometriosis and adenomyosis. The names sound alike, and in both, tissue similar to the lining of the uterus grows where it shouldn't. They are often confused with each other, and they can even happen together.

They are still different conditions. They grow in different places, tend to affect different age groups and cause different symptoms. At my clinics in Andheri East and Vile Parle West, I'm often asked, "Doctor, is it endometriosis or adenomyosis?" This guide explains the difference in simple terms.

First, a quick look at the uterus

The uterus has three layers. The inner lining (endometrium) thickens every month and is shed as your period. The middle layer (myometrium) is a thick muscle wall. The outer layer covers the uterus. Where the misplaced lining-like tissue grows decides which condition you have.

What is endometriosis?

In endometriosis, tissue similar to the uterine lining grows outside the uterus. It can grow on the ovaries, fallopian tubes, the ligaments behind the uterus and the lining of the pelvis. Sometimes it also grows on the bowel or bladder.

This tissue responds to your monthly hormones and bleeds, but the blood has no way to leave the body. Over time, this causes inflammation, scarring and adhesions, where organs stick together. On the ovary, it can form a cyst filled with old blood, called an endometrioma or "chocolate cyst". Endometriosis affects roughly 1 in 10 women of reproductive age.

What is adenomyosis?

In adenomyosis, the lining tissue grows into the muscle wall of the uterus. Each month it swells and bleeds within the muscle, so the uterus becomes enlarged, bulky and tender. It can be spread throughout the wall (diffuse adenomyosis) or form a localised lump (focal adenomyosis or adenomyoma). The lump is sometimes mistaken for a fibroid.

A simple way to remember it:

• Endometriosis = outside the uterus

• Adenomyosis = inside the wall of the uterus

Key differences at a glance

1. Where it grows

Endometriosis: Outside the uterus, on the ovaries, tubes, pelvic lining, bowel or bladder.

Adenomyosis: Inside the muscle wall of the uterus.

2. Who it usually affects

Endometriosis: Often starts in the teens or twenties. Many women remember painful periods from their very first cycles.

Adenomyosis: Traditionally diagnosed between 35 and 50, especially in women who have had children or previous uterine surgery such as a C-section or D&C. With better scans, we now also find it in younger women.

3. Main symptoms

Endometriosis:

• Severe period pain that gets worse over time

• Pelvic pain between periods

• Deep pain during intercourse

• Pain while passing stools or urine, especially during periods

• Bloating, fatigue and difficulty conceiving

Adenomyosis:

• Heavy, prolonged periods, often with clots

• Painful, cramping periods

• A feeling of heaviness or pressure in the lower abdomen

• An enlarged, tender uterus

• Tiredness and weakness caused by anaemia from heavy bleeding

Some women with either condition have very few symptoms. Up to a third of women with adenomyosis may have none at all.

4. Effect on fertility

Endometriosis: One of the most common causes of difficulty conceiving. It can damage the ovaries, block or distort the tubes and create inflammation that affects eggs and implantation.

Adenomyosis: Can make it harder for an embryo to implant and is linked to a higher risk of miscarriage, including in IVF pregnancies.

Book a consultation

If you recognise these symptoms, you don't have to live with the pain. Dr. Ria Katwala Solanki consults at:

• Amardeep Nursing Home, Andheri East

• Bhartiya Arogya Nidhi Hospital, Vile Parle West

• Aviva Cancer Centre, Vile Parle West

Call +91-8108171787 or book an appointment through our Contact page.

Disclaimer: This article is for general information only and is not a substitute for personal medical advice. Please consult a qualified gynaecologist for diagnosis and treatment.