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PubMed This is a summary of 18 peer-reviewed journal articles Updated
Rheumatology

Recognizing Symptoms and Warning Signs of Caplan Syndrome

At a Glance

Caplan syndrome combines rheumatoid arthritis with dust-related lung disease. Joint pain, swelling, and prolonged morning stiffness are common, while lung nodules may cause no symptoms or may lead to cough and shortness of breath; severe breathing trouble needs emergency care.

Because Caplan syndrome involves the intersection of two different conditions—rheumatoid arthritis (RA) and pneumoconiosis—it can produce a wide range of symptoms. For many people, the joint symptoms of RA are the first sign of trouble, and the lung nodules may be discovered incidentally during an imaging scan [1][2]. Understanding how these conditions overlap can help you and your care team monitor your health more effectively.

Joint Symptoms: The Autoimmune Connection

The joint symptoms in Caplan syndrome are typical of rheumatoid arthritis. They occur because the immune system mistakenly attacks the lining of the joints, leading to inflammation [3]. These symptoms often include:

  • Symmetric Pain and Swelling: You will typically feel pain and see swelling in the same joints on both sides of your body (for example, both wrists or both sets of knuckles) [4][5].
  • Prolonged Morning Stiffness: A hallmark of RA is stiffness that lasts for more than 30 to 60 minutes after you wake up or after periods of inactivity [5].
  • Warmth and Redness: Affected joints may feel warm to the touch or appear red during a “flare” or period of high disease activity [6].
  • Small Joint Involvement: While any joint can be affected, the small joints of the hands, wrists, and feet are often the first to show symptoms [4].

Lung Symptoms: The Occupational Connection

The lung component of Caplan syndrome is caused by the body’s reaction to inhaled mineral dust (like coal or silica) [3]. It is important to know that many patients have asymptomatic nodules, meaning they feel no respiratory distress even though nodules are visible on a scan [7]. When symptoms do occur, they may include:

  • Chronic Cough: A persistent cough that does not go away after a cold or flu [6].
  • Shortness of Breath (Dyspnea): You might notice you get winded more easily during physical activities, such as climbing stairs or walking long distances [8][9].
  • Chest Discomfort: Some patients report a feeling of tightness or mild aching in the chest area [6].

When to Seek Medical Care: An Action Plan

In Caplan syndrome, the lungs can sometimes be more vulnerable to infections, medication toxicity, or other complications. It is vital to know when a symptom is routine and when it requires immediate action [6][10].

Emergency Symptoms (Call 911 or go to the Emergency Room)
Seek immediate emergency care if you experience:

  • Severe or rapidly worsening shortness of breath.
  • Blue tint to your lips or face (cyanosis).
  • Fainting, severe dizziness, or new confusion.
  • Inability to speak in full sentences due to breathlessness.
  • Coughing up more than a small streak of blood (substantial hemoptysis) [11].
  • Sudden, severe chest pain.

Same-Day Clinician Contact (Call your doctor’s office)
Contact your care team promptly (within 24 hours) if you notice:

  • A new or persistent fever, especially if you are taking immune-suppressing medications [6][12].
  • A new or worsening cough that does not go away.
  • Unexplained weight loss or night sweats, which can be signs of a serious infection like tuberculosis (TB) or malignancy [13][14].
  • A gradual but noticeable decline in your breathing ability over a few days or weeks [15][16].

How Symptoms May Progress

The course of Caplan syndrome varies greatly from person to person. For some, the lung nodules remain stable for years without ever causing breathing problems [2][1]. In other cases, the nodules may grow, join together (coalesce), or develop hollow centers (cavitate) [17][18].

Interestingly, your joint symptoms and your lung symptoms may not always flare at the same time. You could have a period where your joints feel excellent but your lung scans show new activity, or vice versa [6][5]. Regular check-ups with both a rheumatologist and a pulmonologist are the best way to stay ahead of these changes.

Common questions in this guide

What symptoms might appear first in Caplan syndrome?
Rheumatoid arthritis symptoms may appear first, including pain and swelling in matching joints on both sides of the body, especially the hands, wrists, and feet. Morning stiffness lasting more than 30 to 60 minutes is common. Lung nodules may also be found on imaging even when breathing feels normal.
Can Caplan syndrome cause coughing or trouble breathing?
Yes. Some people have no breathing symptoms despite having lung nodules, while others develop a persistent cough, shortness of breath with activity, or chest discomfort. A new or worsening cough or a gradual decline in breathing should be discussed promptly with a clinician.
Which Caplan syndrome symptoms require emergency care?
Call emergency services for severe or rapidly worsening shortness of breath, blue lips or face, fainting, severe dizziness, new confusion, or inability to speak in full sentences because of breathlessness. Sudden severe chest pain or coughing up more than a small streak of blood also requires emergency care.
When should I call my doctor about Caplan syndrome symptoms?
Contact your care team within 24 hours for a new or persistent fever, especially while taking immune-suppressing medicine, or for a new or worsening cough. Unexplained weight loss or night sweats and a noticeable decline in breathing over days or weeks also need prompt assessment.
Do Caplan syndrome joint and lung symptoms flare at the same time?
Not necessarily. Joint symptoms can improve while lung findings change, or lung findings can remain stable while joint symptoms worsen. Regular follow-up with a rheumatologist and pulmonologist helps monitor both parts of the condition.
Can Caplan syndrome lung nodules remain stable?
Yes. In some people, the nodules stay stable for years without causing breathing problems. In others, they may grow, join together, or develop hollow centers, so ongoing follow-up with the care team is important.

Questions For You

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Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.How do we distinguish between a flare of my rheumatoid arthritis and a potential complication in my lungs?
  2. 2.Should I have a baseline tuberculosis (TB) test, and how often should we screen for infections while I am on immunosuppressive medications?
  3. 3.What specific threshold of breathing difficulty or cough should trigger a call to your office versus a trip to the emergency room?
  4. 4.Given my history of dust exposure, are there specific vaccinations you recommend to protect my lungs?
  5. 5.Is my current level of shortness of breath expected, or does it suggest my lung function needs reassessment?

References

References (18)
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    Caplan's Syndrome with a twist.

    Deepak J, Kenaa B

    International journal of clinical case reports and reviews : open access 2020; (2(1)) doi:10.31579/2690-4861/007.

    PMID: 34027516
  2. 2

    A four-year follow-up of Caplan's syndrome: A case report.

    Wang L, Liu Y, Zhang Y, Hu Y

    The Journal of international medical research 2025; (53(6)):3000605251353738 doi:10.1177/03000605251353738.

    PMID: 40586547
  3. 3

    Amyloid A amyloidosis in a patient with Caplan's syndrome, with special reference to genetic predisposition.

    Nakamura T, Shiraishi N, Morikami Y, et al.

    Modern rheumatology case reports 2020; (4(2)):212-217 doi:10.1080/24725625.2020.1749361.

    PMID: 33087017
  4. 4

    Caplan Syndrome: A Case Report.

    Laouali AMM, Soumaila M, Tinni IA, et al.

    Clinical case reports 2026; (14(1)):e71864 doi:10.1002/ccr3.71864.

    PMID: 41541043
  5. 5

    Treatment with Rituximab in Rheumatoid Pneumoconiosis: A Case Report.

    Yasmine M, Kaouther M, Dhia K, et al.

    Current drug safety 2023; (18(3)):383-385 doi:10.2174/1574886317666220428132311.

    PMID: 37254279
  6. 6

    Case Report: The entanglement of infection and autoimmunity: a case of Caplan syndrome.

    Xiong Z, Wu Y, Tan J, et al.

    Frontiers in immunology 2026; (17()):1715034 doi:10.3389/fimmu.2026.1715034.

    PMID: 41822473
  7. 7

    Preclinical lung disease in early rheumatoid arthritis.

    Robles-Perez A, Luburich P, Rodriguez-Sanchon B, et al.

    Chronic respiratory disease 2016; (13(1)):75-81 doi:10.1177/1479972315620746.

    PMID: 26846584
  8. 8

    Screening for Subclinical Interstitial Lung Disease in Rheumatoid Arthritis Patients: Functional and Radiological Methods.

    Abdelwahab HW, Shalabi NM, Rashad Ghoneim MM, et al.

    Turkish thoracic journal 2022; (23(4)):261-267 doi:10.5152/TurkThoracJ.2022.21263.

    PMID: 35848433
  9. 9

    Adult Acute Respiratory Distress Syndrome (ARDS) Caused by Human Rhinovirus During Janus Kinase Inhibitor Therapy for Rheumatoid Arthritis: A Case Report and Literature Review.

    Choudhuri B, Patra S, Biswas P, et al.

    Cureus 2025; (17(10)):e94213 doi:10.7759/cureus.94213.

    PMID: 41209864
  10. 10

    Caplan syndrome in the 21st century: Cavitary nodules and delayed rheumatoid arthritis.

    Hasanli YS

    Occupational medicine (Oxford, England) 2025; (75(8)):535-539 doi:10.1093/occmed/kqaf094.

    PMID: 40907968
  11. 11

    Clinical Approach to Massive Hemoptysis: Perioperative Focus on Causes and Management.

    Toh TW, Goh JHF, Lie SA, et al.

    Journal of cardiothoracic and vascular anesthesia 2024; (38(10)):2412-2425 doi:10.1053/j.jvca.2024.06.002.

    PMID: 38964992
  12. 12

    Thoracic Manifestations of Rheumatoid Arthritis.

    Groner LK, Green DB, Weisman SV, et al.

    Radiographics : a review publication of the Radiological Society of North America, Inc 2021; (41(1)):32-55 doi:10.1148/rg.2021200091.

    PMID: 33411607
  13. 13

    [Clinical characteristics and related factors of rheumatoid arthritis complicated with tuberculosis infection].

    Tang G, Long L, Han YX, et al.

    Beijing da xue xue bao. Yi xue ban = Journal of Peking University. Health sciences 2020; (52(6)):1029-1033.

    PMID: 33331309
  14. 14

    A 70-Year-Old Woman Receiving Immunosuppressive Therapy Presenting With Iliopsoas Abscess, Pulmonary Miliary Tuberculosis, and Secondary Hemophagocytic Lymphohistiocytosis.

    Nakahara S, Kondo S, Capirig CJ, et al.

    The American journal of case reports 2026; (27()):e950376 doi:10.12659/AJCR.950376.

    PMID: 41736384
  15. 15

    Methotrexate-Associated Pneumonitis and Rheumatoid Arthritis-Interstitial Lung Disease: Current Concepts for the Diagnosis and Treatment.

    Fragoulis GE, Nikiphorou E, Larsen J, et al.

    Frontiers in medicine 2019; (6()):238 doi:10.3389/fmed.2019.00238.

    PMID: 31709258
  16. 16

    Importance of Vaccination Against COVID-19 in a Patient With End-Stage Rheumatoid Arthritis-Associated Interstitial Lung Disease (RA-ILD).

    Garg B, Arbabi A, Kirkland PA, Patel P

    Cureus 2024; (16(7)):e63810 doi:10.7759/cureus.63810.

    PMID: 38974402
  17. 17

    FDG PET/CT in a Case of Caplan Syndrome.

    Zhang J, Dong A, Wang Y

    Clinical nuclear medicine 2025; (50(12)):1224-1226 doi:10.1097/RLU.0000000000006006.

    PMID: 40590078
  18. 18

    Caplan Syndrome Mimicking Progressive Massive Fibrosis on CT: A Case Report.

    Baek J, Han JY

    Journal of the Korean Society of Radiology 2024; (85(4)):789-794 doi:10.3348/jksr.2023.0128.

    PMID: 39130795

This page is for informational purposes only and does not constitute medical advice about Caplan syndrome. Contact your rheumatologist or pulmonologist for personal guidance, and seek emergency care for severe breathing problems or sudden chest pain.