What causes cysts on ovaries

Overview

Ovarian cysts are sacs filled with fluid, air, or other material that form on or within an ovary. Ovaries are part of the female reproductive system, located on either side of the uterus. They are responsible for producing eggs and hormones like estrogen and progesterone. While the term 'cyst' might sound alarming, the vast majority of ovarian cysts are benign and often resolve without any intervention. They are a common occurrence, especially in women of reproductive age.

Types of Ovarian Cysts

Ovarian cysts can be categorized based on their cause and characteristics. Understanding these types is crucial to understanding their potential impact and treatment:

Functional Cysts

These are the most common types of ovarian cysts and are directly related to the menstrual cycle. They are not considered pathological and typically disappear on their own.

• Follicular Cysts: During the menstrual cycle, a follicle (a small sac containing an egg) normally develops. If the follicle doesn't rupture to release the egg, it can continue to grow and fill with fluid, forming a follicular cyst. These usually resolve within a few weeks.
• Corpus Luteum Cysts: After a follicle releases an egg, the remaining sac is called the corpus luteum. If the egg is not fertilized, the corpus luteum usually shrinks. However, if it seals itself off and fills with fluid, it can form a corpus luteum cyst. These typically resolve within a few months.

Other Ovarian Cysts

While functional cysts are common, other types can occur:

• Dermoid Cysts (Cystic Teratomas): These are congenital tumors that can contain various types of tissue, such as hair, skin, or teeth. They are usually benign but can grow quite large and may require surgical removal.
• Cystadenomas: These cysts develop from the surface cells of the ovary and can be filled with a watery or thick, mucus-like fluid. They can also grow large and may need surgical removal.
• Endometriomas: These cysts are associated with endometriosis, a condition where the tissue that normally lines the uterus grows outside the uterus. Endometriomas, often called 'chocolate cysts' due to their contents, form when endometrial tissue grows on the ovary.

Causes of Ovarian Cysts

The development of ovarian cysts can stem from various factors:

Normal Ovulatory Function

As mentioned, functional cysts are a byproduct of ovulation. The hormonal fluctuations of the menstrual cycle are the primary drivers for their formation. These cysts are a normal physiological process and are generally not a cause for concern.

Hormonal Imbalances

While functional cysts are normal, certain hormonal imbalances can contribute to their persistence or larger size. Conditions like Polycystic Ovary Syndrome (PCOS) are characterized by the development of numerous small cysts on the ovaries, although these are often different in nature from the larger, single cysts that can cause symptoms.

Endometriosis

Endometriosis is a significant cause of specific types of ovarian cysts, namely endometriomas. In this condition, endometrial-like tissue implants on the ovaries, leading to cyst formation filled with old blood.

Pelvic Inflammatory Disease (PID)

PID is an infection of the female reproductive organs, which can spread to the ovaries and fallopian tubes. This infection can lead to the formation of cysts or abscesses on the ovaries.

Pregnancy

During early pregnancy, a cyst on the ovary called the corpus luteum is essential for supporting the pregnancy until the placenta takes over. This cyst normally disappears on its own. However, in rare cases, it can persist or grow larger.

Tumors

While less common, ovarian tumors can manifest as cysts. These can be benign (non-cancerous) or malignant (cancerous). Benign tumors like cystadenomas and dermoid cysts are more common than cancerous ones. Ovarian cancer, while rare, can present as a cyst, especially in postmenopausal women.

Symptoms of Ovarian Cysts

Many ovarian cysts, particularly functional ones, cause no symptoms at all. They are often discovered incidentally during a routine pelvic examination or imaging test for another reason. When symptoms do occur, they can include:

• A dull ache or sharp pain in the lower abdomen or side, usually on the side where the cyst is located.
• A feeling of fullness or pressure in the abdomen.
• Bloating.
• Pain during intercourse.
• Changes in bowel or bladder habits (frequent urination, difficulty emptying the bladder, constipation).
• Unexplained vaginal bleeding (less common).

Severe pain, fever, vomiting, or rapid breathing can indicate a more serious complication, such as a ruptured cyst or ovarian torsion (twisting of the ovary), which requires immediate medical attention.

When to See a Doctor

It's advisable to consult a doctor if you experience any persistent pelvic pain, bloating, or other symptoms suggestive of an ovarian cyst, especially if they are severe or accompanied by other concerning signs like fever or vomiting. A doctor can perform a pelvic exam, ultrasound, and other tests to diagnose the type and size of the cyst and recommend the appropriate course of action.