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PubMed This is a summary of 16 peer-reviewed journal articles Updated
Pediatrics

Symptoms & Warning Signs: Recognizing pSLE and MAS

At a Glance

Pediatric lupus (pSLE) often begins gradually with prolonged fevers, joint pain, rashes, and low blood counts. A sudden onset of persistent high fever, confusion, or unusual bleeding could signal Macrophage Activation Syndrome (MAS), a life-threatening complication requiring immediate care.

Recognizing the symptoms of pediatric systemic lupus erythematosus (pSLE) can be challenging because they often appear slowly and mimic common childhood illnesses. Because pSLE is typically more severe than the adult version, knowing the warning signs of both the disease and its complications is vital for early intervention [1].

Early and Insidious Symptoms

The onset of pSLE is often insidious, meaning it develops gradually and may be “sneaky” before becoming obvious [2]. Early symptoms frequently involve multiple organ systems and can include:

  • Prolonged Fever: Unexplained, lingering fevers are a common early sign [3].
  • Joint and Muscle Pain: Arthritis (joint swelling and pain) is more prominent at the time of diagnosis in children than in adults [4]. In younger children who cannot articulate joint pain, this may look like limping, refusing to walk, or extreme clumsiness in the morning.
  • Skin and Mucosal Changes: This includes the classic “butterfly rash” across the cheeks, sensitivity to sunlight, and mucocutaneous disorders like painless sores in the mouth or nose [2].
  • Blood Abnormalities: Known as cytopenias, these involve a drop in blood cell counts. This may look like anemia (low red blood cells), leukopenia (low white blood cells), or thrombocytopenia (low platelets) [2][3].

The Age of Onset Matters

The way pSLE first appears can change depending on the child’s age:

  • Very Early-Onset (Under Age 5): These children often present with a more severe, multisystemic condition from the very beginning [5]. Because it is so rare at this age, doctors may investigate underlying genetic causes or “inborn errors of immunity” [6][7].
  • Peripubertal pSLE (Pre-teen/Adolescent): This is the most common time for pSLE to appear [8]. As children approach puberty, the disease becomes much more common in girls than in boys [8].

A Critical Warning: Macrophage Activation Syndrome (MAS)

Macrophage Activation Syndrome (MAS) is a severe, potentially life-threatening complication where the immune system becomes dangerously overactive [3]. It can be the very first sign of lupus or occur during a flare [9].

MAS is notoriously difficult to diagnose because it mimics a severe infection or a typical lupus flare [9][10]. Parents should watch for these “red flag” warning signs:

  • High, Persistent Fever: A fever that does not go away as expected [3].
  • Swelling: An enlarged liver or spleen (often felt as fullness or pain in the abdomen) or swollen lymph nodes [3].
  • Neurological Changes: Confusion, extreme irritability, or seizures [11].
  • Signs of Dropping Blood Counts: Sudden extreme paleness, unusual bruising, petechiae (tiny red or purple spots on the skin), or unusual bleeding from the gums or nose [3].

In the hospital, doctors look for specific markers of MAS, such as extremely high levels of ferritin (a protein that stores iron) and LDH (an enzyme released during cell damage) [12][13].

Precursor Conditions

Sometimes, a single symptom appears long before a full pSLE diagnosis. Immune Thrombocytopenia (ITP), a condition where the body destroys its own platelets leading to easy bruising or bleeding, can be a prodromal (precursor) condition [14]. Some children are diagnosed with ITP months or even years before they fulfill the full criteria for lupus [15][16]. Monitoring children with ITP for other lupus symptoms is a key part of early detection.

Common questions in this guide

What are the early warning signs of pediatric lupus?
Early signs of pediatric lupus often include prolonged, unexplained fevers, joint pain or limping, extreme fatigue, sun-sensitive rashes, and painless sores in the mouth or nose. Because these develop gradually, they can easily be mistaken for common childhood illnesses.
What is Macrophage Activation Syndrome (MAS)?
MAS is a severe, life-threatening complication of lupus where the immune system becomes dangerously overactive. It causes persistent high fevers, organ swelling, and sudden drops in blood counts. It can be the first sign of lupus or occur during a flare.
How do doctors test for MAS during a lupus flare?
Doctors look for red flags like severe bleeding, confusion, and fever that will not go away. In the hospital, they will also run blood tests to check for extremely high levels of ferritin and the LDH enzyme, which indicate cell damage and MAS.
Can low platelets be an early sign of lupus in children?
Yes, a condition called Immune Thrombocytopenia (ITP), which causes low platelets and easy bruising, can sometimes be a precursor. Some children are diagnosed with ITP months or even years before they develop enough symptoms for a full lupus diagnosis.
When should I take my child to the ER for pSLE symptoms?
You should seek emergency medical care if your child develops a persistent high fever, sudden extreme paleness, unusual bleeding or bruising, severe confusion, extreme irritability, or seizures. These can be signs of MAS.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Are my child’s current symptoms considered a typical lupus 'flare,' or are there signs of Macrophage Activation Syndrome (MAS)?
  2. 2.Should we test my child's ferritin and LDH levels to establish a baseline in case of future fevers?
  3. 3.Given my child's age of onset, should we consider genetic testing for monogenic causes of lupus?
  4. 4.Does my child's history of low platelets (ITP) change how we monitor their blood counts going forward?
  5. 5.What specific 'red flag' symptoms should trigger an immediate call to your office or a trip to the emergency room?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (16)
  1. 1

    Age of onset influences on clinical and laboratory profile of patients with systemic lupus erythematosus.

    Sassi RH, Hendler JV, Piccoli GF, et al.

    Clinical rheumatology 2017; (36(1)):89-95 doi:10.1007/s10067-016-3478-4.

    PMID: 27858177
  2. 2

    Clinical characteristics of early-onset paediatric systemic lupus erythematosus in a single centre in China.

    Hou Y, Wang L, Luo C, et al.

    Rheumatology (Oxford, England) 2023; (62(10)):3373-3381 doi:10.1093/rheumatology/kead086.

    PMID: 36810668
  3. 3

    Clinical spectrum and therapeutic management of systemic lupus erythematosus-associated macrophage activation syndrome: a study of 20 Moroccan adult patients.

    Wafa A, Hicham H, Naoufal R, et al.

    Clinical rheumatology 2022; (41(7)):2021-2033 doi:10.1007/s10067-022-06055-9.

    PMID: 35179662
  4. 4

    Comparison of clinical presentation and outcome of childhood-onset and adulthood-onset of systemic lupus erythematosus among Indonesian patients.

    Hamijoyo L, Sapartini G, Rahmadi AR, et al.

    Lupus 2022; (31(6)):759-764 doi:10.1177/09612033221093482.

    PMID: 35379039
  5. 5

    Characteristics of 1555 childhood-onset lupus in three groups based on distinct time intervals to disease diagnosis: a Brazilian multicenter study.

    Novak GV, Molinari BC, Ferreira JC, et al.

    Lupus 2018; (27(10)):1712-1717 doi:10.1177/0961203318787037.

    PMID: 30020023
  6. 6

    Case Report: p40 deficiency underlying pediatric-onset systemic lupus erythematosus.

    Nieto-Patlán A, Fernández Dávila NS, Wang Y, et al.

    Frontiers in pediatrics 2024; (12()):1425874 doi:10.3389/fped.2024.1425874.

    PMID: 39228435
  7. 7

    Genetic landscape of early-onset systemic lupus erythematous in India.

    Sharma M, Pilania RK, Volpi S, et al.

    Rheumatology (Oxford, England) 2026; (65(6)) doi:10.1093/rheumatology/keaf631.

    PMID: 42251732
  8. 8

    Childhood-Onset Systemic Lupus Erythematosus: Southeast Asian Perspectives.

    Tang SP, Lim SC, Arkachaisri T

    Journal of clinical medicine 2021; (10(4)) doi:10.3390/jcm10040559.

    PMID: 33546120
  9. 9

    Macrophage activation syndrome as a presenting feature in juvenile systemic lupus erythematosus.

    Ramadoss I, Rengabashyam P, Seetharaman Varadhan M, Ponniah Subramanian AR

    Lupus 2024; (33(11)):1254-1259 doi:10.1177/09612033241272972.

    PMID: 39109623
  10. 10

    Using Diagnostic Radiological Imaging Modalities to Explore Neurological Dysfunction and Renal Failure in the Intersection of Hemophagocytic Lymphohistiocytosis, Macrophage Activation Syndrome, and Lupus.

    Cazzaniga J, Georgiyeva K, Siguenza A, et al.

    Cureus 2024; (16(2)):e54005 doi:10.7759/cureus.54005.

    PMID: 38496127
  11. 11

    Neuropsychiatric manifestations in childhood-onset systemic lupus erythematosus.

    Appenzeller S, Pereira DR, Julio PR, et al.

    The Lancet. Child & adolescent health 2022; (6(8)):571-581 doi:10.1016/S2352-4642(22)00157-2.

    PMID: 35841921
  12. 12

    A Cytokine Storm Unveiled: Diagnostic Challenges of Macrophage Activation Syndrome in the Context of Undiagnosed Systemic Lupus Erythematosus in an Adolescent.

    Devadkar AP, Kanitkar SA

    Annals of African medicine 2026; (25(2)):467-470 doi:10.4103/aam.aam_99_25.

    PMID: 40576400
  13. 13

    Macrophage activation syndrome in systemic lupus erythematosus: a multicenter, case-control study in China.

    Liu AC, Yang Y, Li MT, et al.

    Clinical rheumatology 2018; (37(1)):93-100 doi:10.1007/s10067-017-3625-6.

    PMID: 28409239
  14. 14

    Systemic lupus erythematosus, following prodromal idiopathic thrombocytopenic purpura, presenting with skin lesions resembling malignant atrophic papulosis.

    Wallace MP, Thomas JM, Meligonis G, Ha T

    Clinical and experimental dermatology 2017; (42(7)):774-776 doi:10.1111/ced.13158.

    PMID: 28691162
  15. 15

    A Rare Case of Systemic Lupus Erythematosus Manifesting as Genital Ulcers.

    Paidi G, V H

    Cureus 2022; (14(4)):e23818 doi:10.7759/cureus.23818.

    PMID: 35530917
  16. 16

    Evans Syndrome in the Context of Incomplete Systemic Lupus Erythematosus.

    Abu Kar S, Kaur A

    Cureus 2022; (14(6)):e25795 doi:10.7759/cureus.25795.

    PMID: 35836439

This page provides educational information about pSLE and MAS symptoms. It does not replace professional medical advice. Always contact a pediatric rheumatologist or seek emergency care if you suspect your child is experiencing symptoms of MAS or a severe lupus flare.

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