Endometriosis is one of those health conditions that is rarely discussed, yet affects millions of women worldwide. Many suffer from it for years without knowing exactly what is happening to them, normalizing intense pain or discomfort that, in reality, shouldn’t be part of their daily lives. That’s why understanding what endometriosis is and how it manifests is a key step in seeking help, obtaining an early diagnosis, and improving quality of life.

In simple terms, endometriosis occurs when tissue similar to the lining of the uterus (the endometrium) grows outside of it. This tissue can appear on the ovaries, fallopian tubes, the outer surface of the uterus, the bladder, the intestines, and, less frequently, other parts of the body. The problem is that this “misplaced” tissue reacts to the hormonal changes of the menstrual cycle, causing inflammation, pain, and, over time, scarring or adhesions.

One of the major challenges of endometriosis is that it doesn’t always manifest in the same way. Some women with extensive lesions have few or no symptoms, while others with small areas of endometriosis suffer from very intense pain. This variability means the disease often goes unnoticed or is mistaken for other gynecological problems.

To better understand endometriosis, it’s helpful to imagine how the menstrual cycle works. Each month, the endometrium thickens to prepare for a possible pregnancy. If pregnancy doesn’t occur, the tissue sheds and is expelled during menstruation. In endometriosis, the tissue that grows outside the uterus also reacts to hormones, but it has no way to be eliminated. This causes internal inflammation, persistent pain, and, in some cases, microscopic internal bleeding that irritates nearby organs.

The most well-known symptom of endometriosis is severe menstrual pain. This is not simply discomfort relieved by painkillers, but pain that can be debilitating, forcing women to miss work, school, or cancel daily activities. Many women describe this pain as stabbing, deep, or constant, and it tends to worsen over time.

Another very common symptom is chronic pelvic pain, meaning pain in the lower abdomen that isn’t limited to the menstrual period. It can appear a few days before menstruation, during ovulation, or even be present for almost the entire month. This type of pain is often one of the main reasons women consult a healthcare professional, although the correct diagnosis isn’t always made immediately.

Endometriosis can also cause pain during or after sexual intercourse. This symptom, called dyspareunia, is usually deep and persistent, and can seriously affect the intimate and emotional lives of those affected. Many women feel uncomfortable discussing this topic, which contributes to keeping the problem even more hidden.

Digestive problems are another often overlooked sign. Bloating, diarrhea, constipation, nausea, or pain during bowel movements can be associated with endometriosis, especially when the tissue reaches the intestines. In some cases, these symptoms are mistaken for conditions such as irritable bowel syndrome, thus delaying proper diagnosis.

Extreme fatigue is another common, yet poorly understood, symptom. It’s not simply a feeling of tiredness, but a persistent exhaustion that doesn’t improve with rest. Chronic pain, inflammation, and hormonal changes can contribute to this condition, affecting concentration, mood, and daily productivity.

One of the most sensitive aspects of endometriosis is its relationship with infertility. It is estimated that a significant percentage of women who have difficulty conceiving suffer from endometriosis. This can be due to inflammation, adhesions that alter the anatomy of the reproductive organs, or problems related to egg quality. However, it is important to clarify that not all women with endometriosis will be infertile, and many are able to become pregnant with or without treatment.

Beyond the physical symptoms, endometriosis has a significant emotional impact. Living with constant pain, feeling misunderstood, or hearing that “menstrual pain is normal” can lead to anxiety, frustration, and even depression. Delayed diagnosis, which in many cases can take years, exacerbates this psychological impact.

Regarding the causes of endometriosis, there is still no single, definitive explanation. Several theories have been proposed, such as retrograde menstruation (when part of the menstrual flow flows back towards the pelvis), genetic factors, immune system abnormalities, and hormonal imbalances. It is very likely that it is a combination of several factors.

Diagnosing endometriosis is not always straightforward. It often begins with a thorough medical interview and a gynecological examination. Ultrasounds and MRIs can help identify some lesions, but the definitive diagnosis is usually confirmed by laparoscopy, a minimally invasive surgical procedure that allows direct visualization of the affected areas.