Lactational mastitis can manifest with pain, swelling, warmth, and redness in a breast area, sometimes accompanied by fever, chills, and general malaise. It’s a condition that can be frightening, especially in the first few months after childbirth, but recognizing its signs early allows for seeking appropriate support.
Today, mastitis is no longer considered solely the result of a "blocked duct" or a breast that has not been completely emptied. Recent guidelines describe it as part of an inflammatory spectrum that can include duct narrowing, edema, inflammatory mastitis, and, in some cases, bacterial mastitis.
This guide offers general information and does not allow for making a diagnosis. In the presence of significant pain, fever, worsening symptoms, or doubts, it is necessary to consult a doctor, midwife, or a healthcare professional competent in breastfeeding.
What is lactational mastitis?
Mastitis is an inflammation of the mammary gland that occurs most frequently during breastfeeding. It can affect a localized area of the breast and is not always initially caused by a bacterial infection.
According to Clinical Protocol #36 of the Academy of Breastfeeding Medicine, mastitis is part of a spectrum of conditions related to duct inflammation, congestion, and tissue edema. An initially inflammatory mastitis can, in some cases, evolve into a bacterial form requiring medical evaluation and specific treatment.
For this reason, it is important to avoid both underestimating symptoms and resorting independently to aggressive practices in an attempt to clear or empty the breast.
What are the symptoms of mastitis?
Symptoms can appear quickly and vary in intensity. The presence of a single sign is not enough to self-diagnose mastitis.
Among the most common symptoms are:
- pain or strong tenderness in an area of the breast;
- warm, swollen, or hardened area;
- localized redness;
- feeling of tension or burning;
- pain during or after feeding;
- fever;
- chills;
- muscle aches;
- fatigue and general flu-like malaise.
The Bambino Gesù Pediatric Hospital lists characteristic symptoms as pain, warmth, and hardening of a breast area, along with the possible appearance of fever, chills, muscle aches, and malaise.
Breast engorgement or mastitis?
Breast engorgement and mastitis can have some common symptoms, but they are not the same condition.
Engorgement often occurs in the first few days after birth, when milk production increases. The breasts can appear very full, tense, and sore, and swelling can affect both breasts. Generally, there are no significant general symptoms such as persistent fever, chills, or severe malaise.
Mastitis, on the other hand, tends to affect a more localized area, often only one breast, with pain, warmth, edema, and possible redness. Fever and flu-like symptoms may also appear.
The difference is not always easy to recognize without an assessment. If symptoms are intense, localized, associated with fever, or do not improve, it is advisable to contact a healthcare professional.
What factors can promote inflammation?
There is not always a single cause. Mastitis can be favored by a combination of inflammation, increased milk production, edema, and an alteration of the normal balance of the mammary microbiome.
Factors that can contribute include:
- milk production exceeding the baby's needs;
- sudden changes in feeding frequency;
- excessive use of the breast pump;
- too high suction or unsuitable breast pump flange;
- repeated attempts to completely empty the breast;
- deep or energetic massages;
- persistent pressure from a bra or too tight clothing;
- difficulty with latch or milk transfer;
- previous episodes of mastitis or oversupply.
Mastitis should not be interpreted as a consequence of poor personal hygiene. It is not necessary to constantly wash the breast or obsessively sterilize all household items. Normal daily hygiene, hand washing, and proper cleaning of the breast pump after use are sufficient.
To learn more about hygiene, nipple sensitivity, and daily comfort, you can also read the MYSANITY guide on breast care during breastfeeding.
What to do at the first symptoms
In the presence of mild symptoms, it is important to observe their course, rest, and seek guidance from a competent professional, especially when it is difficult to distinguish normal breast fullness from an inflammatory process.
The most recent recommendations generally suggest:
- breastfeeding according to the baby's cues and demands;
- avoiding adding feedings or pumping sessions solely to completely empty the breast;
- expressing, when necessary, only a small amount of milk to reduce excessive tension;
- applying cold externally, protecting the skin with a cloth;
- getting rest and drinking fluids according to thirst;
- checking that the bra does not create localized pressure;
- requesting an assessment of latch and breastfeeding management;
- using medications only after receiving instructions from a doctor or pharmacist.
The goal is not to force the breast to empty, but to reduce inflammation and edema without stimulating even greater milk production.
Can I continue breastfeeding with mastitis?
In most cases, it is possible to continue breastfeeding. Even bacterial mastitis itself does not make the milk dangerous for the baby and does not automatically require discontinuation of breastfeeding.
Feedings should continue according to the baby's needs and the mother's comfort, without repeatedly trying to drain the affected breast. If the areola is so swollen and sore that latching is impossible, or if complications are present, the doctor or lactation professional can temporarily indicate how to manage feedings and any milk expression.
An abrupt and unsupported interruption can increase breast tension. It is therefore preferable not to make autonomous decisions and to receive personalized support.
For guidance on initiating feedings, positions, and seeking help, you can also consult the MYSANITY article dedicated to first breastfeeding.
What to avoid in case of mastitis
Some traditionally recommended remedies can further irritate tissues or increase milk production.
It is preferable to avoid:
- deep, energetic, or painful massages;
- vibrating devices used on the breast;
- attempts to forcefully squeeze or express a presumed "plug";
- breast pump used repeatedly to keep the breast empty;
- too high suction during expression;
- very intense or prolonged heat application;
- rigid or too tight bras;
- creams, oils, or topical remedies not indicated by a professional;
- antibiotics taken without prescription;
- abrupt cessation of breastfeeding without assistance.
A deep massage can increase edema, inflammation, and microtrauma. Any manual maneuvers should be gentle and taught by a qualified professional.
The nursing bra must support, not just cover
During breastfeeding, breasts can become fuller, heavier, and more sensitive. Many nursing bras are constructed as simple elastic tops: they cover the breast and allow access to the cup, but may offer limited support.
At the opposite extreme, a model that is too tight, rigid, or the wrong size can exert persistent pressure on an area of the breast. The correct solution is to seek real support that does not become compression.
A supportive nursing bra should have:
- a stable and properly fitting underband;
- cups capable of containing the breast even laterally;
- sufficient depth to prevent spillage and pressure;
- adjustable straps proportionate to the weight of the breast;
- multiple band adjustment options;
- elastic fabric that maintains its shape;
- practical opening that does not weaken cup support;
- edges and seams that do not press on breast tissue.
The bra does not cure and cannot guarantee the prevention of mastitis. However, a correct fit can contribute to comfort, supporting the breast without creating pressure points.
To learn more, you can read the MYSANITY guide on mistakes to avoid when choosing a nursing bra and the article dedicated to fabrics for nursing bras.
When to contact a doctor
It is not necessary to wait until the pain becomes unbearable. It is important to seek an evaluation if symptoms are intense, worsen rapidly, or do not show improvement within 12–24 hours.
Promptly contact your doctor or healthcare provider if you experience:
- persistent or high fever;
- chills and severe malaise;
- increasing pain or redness;
- hard area or lump that does not reduce;
- difficulty eating or drinking normally;
- unusual nipple discharge;
- frequently recurring symptoms;
- no improvement after starting prescribed therapy;
- any condition that makes the mother feel very weak or worried.
If there is no improvement after appropriate therapy, the doctor may consider further investigations to rule out a collection or an abscess. Antibiotics are indicated for bacterial forms and must be chosen and prescribed by a doctor.
Recurrent mastitis: why an evaluation is needed
Repeated episodes in the same breast area should not be managed by continuously applying the same home remedies. It may be necessary to check breastfeeding management, milk production, breast pump use, bra fit, and the possible presence of a condition requiring investigation.
The doctor can determine if tests, ultrasound, or milk culture are indicated. An IBCLC consultant or a competent midwife can observe the latch, feedings, and any factors that maintain excessive stimulation.
Frequently asked questions about lactational mastitis
Is mastitis always a bacterial infection?
No. It can start as an inflammatory process due to edema and duct narrowing. In some cases, it can evolve into bacterial mastitis, which must be evaluated by a doctor.
Does the breast need to be completely emptied?
No. Repeatedly trying to empty it can stimulate greater milk production and increase inflammation and swelling. It is generally preferable to breastfeed according to the baby's needs and express only small amounts for comfort, when necessary.
Is it better to use heat or cold?
Cold can help reduce edema, inflammation, and pain. Heat may be pleasant for some women, but it can also increase vasodilation and worsen swelling: it is therefore best to avoid very hot or prolonged applications.
Can a hard area of the breast be massaged?
Not forcefully. Deep or painful massages can increase tissue trauma. Any gentle maneuvers should be demonstrated by a competent professional.
Is mastitis contagious to the baby?
No. Bacterial mastitis is not considered contagious, and in most cases, it is possible to continue breastfeeding following the instructions received from the healthcare professional.
Does a supportive bra prevent mastitis?
There are no bras capable of preventing or curing mastitis. However, a correctly sized, truly supportive, and non-constricting model can prevent uncomfortable pressure and improve breast comfort during breastfeeding.
Sources and further information
- Academy of Breastfeeding Medicine, Clinical Protocol #36: The Mastitis Spectrum, Revised 2022.
- Italian National Institute of Health – Epicentro, Preventing and treating mastitis, 2024.
- Bambino Gesù Pediatric Hospital, Mastitis and breastfeeding.
- Italian Ministry of Health, Breast milk: instructions for use.
Addressing mastitis with information and support
Mastitis can be painful and challenging, but it should not be faced alone. Observing symptoms, avoiding aggressive maneuvers, and seeking help promptly allows for receiving appropriate guidance for one's situation.
Even the choice of lingerie can contribute to daily well-being. The breast needs to be supported without compression: it is not enough for the bra to cover it; it is important that the band, cups, and straps work together to offer balanced containment.
Discover the MYSANITY collection of nursing bras, designed to combine practical opening, adjustable fit, comfort, and support during the different phases of breastfeeding.
This article is for informational purposes only and does not replace diagnosis, examination, or advice from a doctor, midwife, or other healthcare professional.