Mucus Plug: Overview, Causes, Symptoms, Diagnosis and Treatment

what is mucus plug?


A mucus plug is a clump of mucus that develops in the cervical canal during early pregnancy. This keeps viruses and diseases out of the uterus and away from the baby. The mucus plug will be removed when the cervix prepares to birth the baby. This is a very frequent symptom in late pregnancy.

A mucus plug looks like a thick mucus plug that develops during pregnancy and prevents the cervix from opening. It creates a protective barrier around the uterus, preventing infections and sickness from entering and keeping the baby safe. Consider it a barrier between the vagina and the uterus, which is where the child will be born. When the cervix starts to expand (open) as well as efface (smoothen and shrink) in preparation for labor, the plug will wear off.

The look, size, and texture of mucus plug discharge vary. The colors vary from transparent to off-white to somewhat reddish (red, brown, or pink). It is stringy, sticky, and jelly-like in appearance. The length varies between 1 and 2 inches. It has a little odor.

During pregnancy, unusual vaginal discharge is a frequent occurrence. A typical vaginal discharge is thin, light yellow or white in color, and has a faint yellow or white tinge to it. The mucus plug discharge is a denser, more jelly-like discharge in greater volume. There may be particles of scarlet, pink, or brown blood in it as well.

It is possible to lose the mucus plug in a single glob or gradually over time and remain unaware until it is completely gone. While some bleeding is typical during pregnancy, excessive bleeding may signal placental abruption, placenta previa, or other pregnancy complications. If you have heavy bleeding while pregnant, you should seek medical attention.


The expulsion of the mucus plug is a natural occurrence during pregnancy, signaling various changes in the cervix and the body’s preparation for labor. While the process itself is typically uneventful, there are some symptoms and characteristics associated with the release of the mucus plug:

Gel-Like Discharge

The mucus plug is often described as a gelatinous or jelly-like substance. Its appearance can vary, ranging from clear to slightly cloudy, and may contain streaks of blood, earning it the term “bloody show.”

Color Changes

The color of the mucus plug can be an indicator of its age and the presence of blood vessels. While it is generally clear or slightly white, the inclusion of pink, brown, or red streaks suggests the presence of small blood vessels.

Increased Vaginal Discharge

The expulsion of the mucus plug is often accompanied by an increase in vaginal discharge. This discharge may be more noticeable due to its gelatinous consistency.

No Odor

Unlike some vaginal discharges, the mucus plug typically does not have a strong or foul odor. It is a natural secretion of the cervix and is not associated with infection.

Absence of Pain

The process of expelling the mucus plug itself is usually painless. However, it can be accompanied by other signs of labor progression, which may include contractions and lower back pain.

Timing in Late Pregnancy

The release of the mucus plug commonly occurs in the later stages of pregnancy, usually as the body begins to prepare for labor. However, it’s important to note that its expulsion does not always indicate immediate labor, and it can happen weeks before labor begins.


In preparation for labor, the cervix softens, thins, and opens. The mucus plug in the cervix is dislodged when this happens. The mucus is discharged from the opening of the vaginal canal. A mucus plug is thought to have been lost in this case.

Most pregnant women do not lose their mucus plug until they are 37 weeks or later in their pregnancy. Depending on the circumstances, this might occur many days or even weeks before the baby’s due date. The loss of the mucus plug might indicate dilatation, effacement, or both in the cervix. It signals that labor is on the way, but there is no defined timeline for when further labor signs will appear. When you lose your mucus plug, you may already be in the throes of labor in certain situations.

The following are the possible causes of losing mucus plug:

Cervix Opening

When the cervix begins to efface and dilate in preparation for delivery, the mucus plug may come out into the vaginal canal. It is ready to open in preparation for the baby’s delivery.

Sexual contacts

Sexual relations with a partner are typically not harmful during pregnancy. Sexual intercourse during the last few weeks of pregnancy may cause the mucus plug to dislodge.

Cervical Examination

The healthcare practitioner may do a cervix examination during a pregnancy appointment. As a consequence of the examination, the cervix may be stretched or inflamed. This may result in the mucus plug dislodging.

The loss of the mucus plug does not always imply that labor is on the way. It usually implies, however, that the body as well as the cervix are undergoing substantial changes that will better prepare the woman for future delivery. During pregnancy, the cervix will soften and dilate at some point, allowing the baby to pass through the cervical canal during birth.


Diagnosing the release of the mucus plug is usually a straightforward procedure, often reliant on visual cues and the symptoms reported by the expectant individual. Below is a guide on how medical professionals might approach determining the expulsion of the mucus plug:

Patient History

Healthcare providers initiate the process by gathering a comprehensive medical history from the pregnant individual. This includes details about recent symptoms, the characteristics of vaginal discharge, and any pertinent information related to the pregnancy.

Physical Examination

A thorough physical examination may be conducted to evaluate the overall health of the pregnant individual. Although the expulsion of the mucus plug itself typically does not involve pain, healthcare providers may check for additional signs of labor progression, such as cervical dilation.

Visual Inspection of Discharge

The primary method for diagnosing the mucus plug involves visually inspecting the vaginal discharge. Described as a gelatinous substance with distinctive characteristics, the mucus plug may exhibit pink, brown, or red streaks, indicating the presence of small blood vessels—a phenomenon known as the “bloody show.”

Patient Confirmation

Frequently, the pregnant individual can offer insights into the discharge’s characteristics, including its texture and any observed color changes. Patient confirmation plays a crucial role in the diagnostic process.

Exclusion of Other Causes

Healthcare providers may explore alternative causes of vaginal discharge to rule out infections or other potential complications. Additional tests may be conducted if concerns arise regarding the nature of the discharge.

Timing in Late Pregnancy

Considering the timing of the mucus plug expulsion is essential. Typically occurring in the later stages of pregnancy as the cervix undergoes preparatory changes for labor, understanding the gestational age and recognizing other signs of labor progression adds context to the diagnosis.

Education and Counseling

As an integral part of the diagnostic process, healthcare providers may seize the opportunity to educate the pregnant individual about the significance of the mucus plug, its role in pregnancy, and what to anticipate in the subsequent stages of labor.

When To See A Doctor

If you suspect you have lost your mucus plug and are less than 37 weeks pregnant, contact your healthcare provider immediately. They may be concerned and want to examine your cervix if this is the case.

If you see an unusual quantity of vibrant red blood in the mucus plug discharge, get medical attention immediately since a bloody mucus plug may indicate infection. A pregnancy problem including placental abruption or placenta previa may cause significant bleeding during pregnancy.

If the mucus plug becomes green or has a foul odor, you should see your doctor right away since it might be a sign of infection.

Discussing the indicators of labor with the primary care physician may be educational and reassuring during the final weeks of pregnancy. It is important to address any concerns you have about the symptoms with the healthcare professional.