Swollen lymph nodes during pregnancy are usually caused by a common infection and treated the same way they would be outside of pregnancy: by addressing whatever is triggering the immune response. In most cases that means rest, fluids, and time, or a pregnancy-safe antibiotic if a bacterial infection is involved. The reassuring reality is that the vast majority of swollen nodes in pregnant women are benign. But because pregnancy limits which medications and imaging tools can be used safely, and because a few serious conditions like lymphoma or toxoplasmosis can present with swollen nodes, it helps to understand what your options actually look like when you are expecting.
Why Lymph Nodes Swell During Pregnancy
Lymph nodes are small, bean-shaped filters scattered throughout your body, concentrated in the neck, armpits, and groin. When your immune system is fighting something, the nodes nearest the affected area fill with white blood cells and swell. During pregnancy, your immune system is already in a heightened state of flux. It has to tolerate the developing fetus while still protecting you from pathogens, and that balancing act sometimes makes lymph nodes more reactive than usual.
The most common reasons for swollen lymph nodes in pregnant women are the same as for anyone else: upper respiratory infections, ear infections, dental infections, skin infections, and minor viral illnesses. Pregnancy does not change the basic mechanism. It does, however, change two things that matter for treatment: which drugs are considered safe, and how aggressively doctors are willing to investigate.
When to Call Your Provider
A single tender, moveable node that appears alongside a cold or sore throat and shrinks within a couple of weeks rarely needs any workup at all. You should contact your healthcare provider if the swelling persists for more than two weeks without an obvious cause, if a node is hard or fixed in place rather than rubbery and moveable, if it keeps growing, or if you have accompanying symptoms like unexplained fevers, drenching night sweats, or unintentional weight loss. Those red-flag symptoms raise the possibility of something beyond a routine infection and warrant further investigation.
Swelling in certain locations also gets more attention. Nodes above the collarbone, for instance, are more concerning than a swollen node under the jaw during a bout of pharyngitis. Your provider will consider the location, the size, how fast the node appeared, and whether you have systemic symptoms before deciding whether imaging or a biopsy is warranted.
Safe Diagnostic Imaging During Pregnancy
If your doctor wants a closer look at a swollen node, ultrasound is the go-to first step. It uses no ionizing radiation, is widely available, and is effective for characterizing superficial lymph nodes in the neck, armpit, and groin.1International Journal of Gynecological Cancer. Imaging modalities in pregnant cancer patients Ultrasound can often distinguish a reactive, infection-driven node from one that looks structurally abnormal.
When more detail is needed, MRI is the preferred next step because it also avoids ionizing radiation.2PubMed. Imaging Cancer in Pregnancy Gadolinium-based contrast agents are generally avoided during pregnancy unless the diagnostic benefit clearly outweighs the theoretical risk, so non-contrast MRI is typically used. CT scans and PET scans, which involve radiation, are reserved for situations where the clinical stakes are high enough to justify the exposure, such as staging a confirmed cancer.
Treating Infection-Related Swollen Nodes
Most swollen lymph nodes are driven by an infection, and the treatment is to treat the infection itself. For viral illnesses, that means supportive care: rest, hydration, and managing symptoms. The nodes typically return to normal size within a few weeks once the infection resolves.
For bacterial infections, antibiotics are often necessary. The good news is that most antibiotics are considered safe during pregnancy.3PubMed. Antibiotics and other anti-infective agents in pregnancy and lactation Penicillins are the standard first-line choice, with cephalosporins as a close alternative. When prescribing cephalosporins, doctors generally favor the more commonly used and better-studied ones.4PubMed. Antibiotic chemotherapy during pregnancy and lactation period: aspects for consideration Certain antibiotics are avoided during pregnancy, including tetracyclines (which can affect fetal bone and tooth development) and fluoroquinolones (due to concerns about cartilage development). Your provider will choose the right antibiotic based on the suspected infection and your allergy history.
Managing Pain and Discomfort
Swollen nodes can be tender, and that discomfort is sometimes the symptom that bothers you most. Warm compresses applied to the area for ten to fifteen minutes several times a day can help ease tenderness. This is a simple home remedy that carries no risk during pregnancy.
For pain relief, acetaminophen (Tylenol) is the standard recommendation during pregnancy. Commonly prescribed pain medications appear to be relatively safe during pregnancy, though caution is warranted in late pregnancy because some analgesics can affect the fetus or complicate delivery.5PubMed Central. Treating pain during pregnancy Nonsteroidal anti-inflammatory drugs like ibuprofen are generally avoided, especially in the third trimester, because they can affect fetal heart development and reduce amniotic fluid. If acetaminophen and warm compresses are not enough, talk to your provider rather than reaching for over-the-counter alternatives on your own.
Toxoplasmosis and Swollen Lymph Nodes
One infection that deserves special attention during pregnancy is toxoplasmosis, caused by the parasite Toxoplasma gondii. You can pick it up from undercooked meat, contaminated water, or contact with infected cat feces. In healthy adults, toxoplasmosis often causes nothing more than mild flu-like symptoms and swollen lymph nodes. But in pregnancy, it can cross the placenta and infect the developing baby.
A large retrospective study found that about 14% of women with confirmed toxoplasmosis during pregnancy had clinically detectable lymphadenopathy, and those women were roughly three times more likely to have a baby born with congenital toxoplasmosis compared to women who seroconverted without noticeable lymph node swelling.6PubMed. Association between lymphadenopathy after toxoplasmosis seroconversion in pregnancy and risk of congenital infection That does not mean the swollen nodes themselves caused the problem; rather, visible lymphadenopathy appears to be a marker of a more robust maternal infection, which in turn carries a higher transmission risk.
Treatment depends on the stage of pregnancy and whether fetal infection is confirmed. Spiramycin, a macrolide antibiotic that concentrates in the placenta, is used to reduce the risk of transmission to the fetus. It can lower that risk by roughly 60%. If fetal infection is confirmed after 18 weeks of gestation, doctors switch to a more aggressive combination of pyrimethamine and sulfadiazine, which work together far more potently against the parasite than either drug alone.7Global Library of Women’s Medicine. Toxoplasmosis in Pregnancy In the United States, spiramycin is not commercially available and must be obtained through the FDA on a case-by-case basis after a reference laboratory confirms the infection.
Cat Scratch Disease During Pregnancy
Another infection that commonly presents with swollen lymph nodes is cat scratch disease, caused by the bacterium Bartonella henselae. It is transmitted through a scratch or bite from an infected cat, often a kitten. The hallmark is a swollen, tender lymph node near the site of the scratch, typically in the armpit or neck.
In a case series of pregnant women with cat scratch disease, five of eight had the typical presentation of regional lymph node swelling, while two also developed joint pain, muscle pain, and a type of skin inflammation called erythema nodosum, and one developed an eye complication.8PubMed. Cat scratch disease during pregnancy The good news is that cat scratch disease does not appear to cross the placenta the way toxoplasmosis does. In most cases, it resolves on its own or with a course of pregnancy-safe antibiotics like azithromycin. The nodes can stay swollen for weeks or even a couple of months, which can be anxiety-inducing, but the condition is generally self-limited.
Vaccination-Related Lymph Node Swelling
COVID-19 vaccination brought widespread awareness of a phenomenon that has always occurred with various vaccines: temporary swelling of lymph nodes, usually in the armpit on the same side as the injection. This can happen with flu shots, Tdap boosters, and other vaccines routinely given during pregnancy.
Research on pregnant women who received the Pfizer-BioNTech COVID-19 vaccine found that axillary lymphadenopathy did occur but was actually less common in pregnant women than in non-pregnant women after vaccination.9Ultrasound in Obstetrics & Gynecology. Short-term outcome of pregnant women vaccinated with BNT162b2 mRNA COVID-19 vaccine When it does happen, the swelling typically resolves within a few weeks and does not require any treatment beyond reassurance. The main practical concern is timing: if you have a breast ultrasound or mammogram scheduled, vaccine-related axillary swelling can be mistaken for something worrisome. Letting your imaging provider know about recent vaccinations helps avoid unnecessary biopsies.
When Swollen Nodes Signal Something More Serious
Rarely, swollen lymph nodes during pregnancy turn out to be caused by lymphoma or another malignancy. Lymphoma is one of the more common cancers diagnosed during the reproductive years, so the overlap with pregnancy is not unheard of. The challenge is that treatment needs to balance the mother’s health against fetal safety, and the approach depends heavily on which trimester the diagnosis falls in.
Chemotherapy and radiation during the first trimester carry an increased risk of birth defects, and in most cases where lymphoma is diagnosed early in pregnancy, standard chemotherapy is recommended after pregnancy termination. For women with low-risk disease, such as early-stage Hodgkin lymphoma or slow-growing non-Hodgkin lymphoma, it may be possible to delay treatment until the end of the first trimester while monitoring closely.10Haematologica. The treatment of Hodgkin’s and non-Hodgkin’s lymphoma in pregnancy When lymphoma is diagnosed in the second or third trimester, evidence suggests that full-dose chemotherapy can be given without a major increase in severe fetal complications.
More recent work has explored whether less aggressive strategies might be viable even for Hodgkin lymphoma. A review of cases managed with observation, single-agent vinblastine, or full ABVD chemotherapy found that strategies avoiding multi-drug therapy were associated with excellent outcomes, including 100% overall survival.11PubMed. Management of Hodgkin Lymphoma during pregnancy, review of the literature and description of an homogenous expectative attitude associated with excellent outcome These decisions are highly individualized and involve input from oncology, maternal-fetal medicine, and neonatology teams.
Autoimmune Flares and Lymph Node Swelling
Women with autoimmune conditions like systemic lupus erythematosus (lupus) can experience lymph node swelling as part of a disease flare during pregnancy. Lupus flares are a known risk during pregnancy and the postpartum period, and generalized lymphadenopathy is one of several possible symptoms alongside joint pain, rashes, and fatigue.
Treatment of lupus flares during pregnancy typically involves hydroxychloroquine, low-dose prednisone, pulse intravenous methylprednisolone, and azathioprine.12PubMed. Flares of systemic lupus erythematosus during pregnancy and the puerperium: prevention, diagnosis and management Hydroxychloroquine is particularly important because it has been shown to reduce the frequency of flares during pregnancy and is considered safe throughout all trimesters. Many rheumatologists recommend continuing it even in women who were in remission before conceiving. The key point is that treating the underlying autoimmune condition is what brings the swollen nodes down; you are not treating the nodes themselves.
A Diagnostic Quirk Unique to Pregnancy
There is a peculiar histological phenomenon that can trip up even experienced clinicians. During pregnancy, tissue resembling the uterine lining (called decidual tissue) can occasionally develop in pelvic lymph nodes. When a pathologist examines a biopsied node under the microscope, these decidual changes can look alarmingly similar to metastatic cancer, especially squamous cell carcinoma. Special immunohistochemistry staining that evaluates certain protein markers called cytokeratins can reliably distinguish this harmless pregnancy-related change from actual cancer.13Contemporary Oncology. Gynaecological cancers coexisting with pregnancy – a literature review
This matters practically because if you are pregnant and a lymph node biopsy is performed in the pelvic region for any reason, the pathologist reviewing the tissue should be aware of your pregnancy. Without that context, there is a real risk of a false diagnosis of cancer, which would trigger aggressive and potentially harmful treatment. It is one more reason why communication between all members of your care team is critical during pregnancy.
Practical Steps You Can Take at Home
While you wait for swollen nodes to resolve or for a diagnosis to be confirmed, there are a few things you can do to manage the discomfort and support your body:
- Warm compresses: Apply a warm, damp cloth to the swollen area for 10 to 15 minutes several times a day. This improves blood flow and can ease tenderness.
- Stay hydrated: Adequate fluid intake supports your immune system and helps your body clear infections faster.
- Rest: Your body is already doing extra work growing a baby. If you are fighting an infection on top of that, giving yourself permission to slow down is not laziness; it is a legitimate part of recovery.
- Avoid squeezing or massaging the node: Pressing on swollen nodes can increase irritation and does not help them drain faster.
- Track changes: Note whether the node is getting bigger or smaller, whether new nodes appear, and whether you develop any new symptoms. This information is genuinely useful to your provider.
Home care is appropriate for nodes that are clearly associated with a mild infection and are not accompanied by red-flag symptoms. It is not a substitute for medical evaluation when nodes are persistent, growing, or accompanied by systemic symptoms.
Medications to Avoid
Knowing what not to take is just as important as knowing what is safe. A few medications that people commonly reach for when dealing with swollen, sore lymph nodes are problematic during pregnancy:
- Ibuprofen and naproxen: These NSAIDs are generally avoided, especially in the third trimester, due to the risk of premature closure of a fetal blood vessel called the ductus arteriosus and reduced amniotic fluid.
- Aspirin (high-dose): Low-dose aspirin is sometimes prescribed during pregnancy for other reasons, but high-dose aspirin for pain should be avoided.
- Certain antibiotics: Tetracyclines, fluoroquinolones, and some sulfonamides carry specific fetal risks. Even if a friend or family member recommends an antibiotic that worked for them, never take antibiotics during pregnancy without a prescription from a provider who knows you are pregnant.
- Herbal supplements: Many herbal remedies marketed for immune support or lymphatic drainage have not been studied in pregnancy. Some, like echinacea or goldenseal, have uncertain safety profiles. Stick to proven treatments rather than experimenting.
When in doubt, acetaminophen for pain and a call to your provider for anything else is the safest default. The instinct to avoid all medications during pregnancy is understandable but can backfire if an infection goes untreated and progresses.