Several autoimmune diseases cause chest pain, but lupus is the most common culprit. About 20% of people with lupus develop pericarditis, an inflammation of the sac surrounding the heart, and roughly 10% experience pleurisy, inflammation of the lining around the lungs. Both produce sharp chest pain that can feel alarming. Other autoimmune conditions, including rheumatoid arthritis, ankylosing spondylitis, scleroderma, and sarcoidosis, can also cause chest pain through different mechanisms.
Lupus: The Most Common Cause
Lupus attacks multiple organ systems, and the chest is a frequent target. The two main sources of chest pain in lupus are pericarditis and pleurisy. Pericarditis causes pain in the center of the chest that typically worsens when you lie flat and improves when you lean forward. Pleurisy produces sharp, stabbing pain on one or both sides of the chest that gets worse with deep breathing, coughing, or sneezing. In a large study from the University of Toronto Lupus Clinic, pericarditis was identified in about 20% of over 2,100 patients, and affected individuals rated their chest pain at a median severity of 6 out of 10.
A less common but more serious possibility is lupus myocarditis, where the immune system inflames the heart muscle itself. This occurs in 5 to 10% of lupus patients and can impair the heart’s ability to pump effectively. It may cause chest pressure, shortness of breath, and fatigue rather than the sharp, position-dependent pain of pericarditis.
Rheumatoid Arthritis and Lung Involvement
Rheumatoid arthritis is best known for joint pain, but it can also cause inflammation in the lining of the lungs (pleuritis) and a condition called interstitial lung disease, where scarring gradually replaces healthy lung tissue. Symptoms of interstitial lung disease include chest pain, shortness of breath during activity, a persistent cough, and fatigue. These symptoms overlap with many common lung conditions, which means they’re often attributed to something else before RA is considered. If you have rheumatoid arthritis and notice a new, unexplained cough or increasing breathlessness alongside chest discomfort, lung involvement is worth investigating.
Ankylosing Spondylitis and Chest Wall Pain
Ankylosing spondylitis primarily affects the spine, but about one-third of people with the condition develop inflammation in other areas, including the chest. When it reaches the rib joints, it causes costochondritis, which is inflammation where the ribs connect to the breastbone or spine. This produces a distinctive pain: it gets worse when you take a deep breath, sneeze, cough, exercise, or hold certain positions. Over time, the inflammation can limit how far your chest expands, making it physically harder to breathe deeply. The pain tends to be felt across the front of the chest wall and can be mistaken for a heart or lung problem.
Scleroderma and Pulmonary Hypertension
Scleroderma (systemic sclerosis) causes hardening and thickening of connective tissue, and the lungs and heart are particularly vulnerable. Between 8 and 12% of scleroderma patients develop pulmonary arterial hypertension, a condition where blood pressure in the arteries leading to the lungs rises dangerously high. This forces the right side of the heart to work harder and can cause chest tightness, chest pain during exertion, and progressive shortness of breath. Pulmonary arterial hypertension is one of the leading causes of death in scleroderma, so new or worsening chest symptoms in someone with this condition warrant prompt evaluation.
Sarcoidosis and Heart Granulomas
Sarcoidosis causes clumps of immune cells called granulomas to form in various organs, most often the lungs and lymph nodes. When granulomas develop in lung tissue, they can cause chest pain or tightness along with a dry cough. More concerning is cardiac sarcoidosis, where granulomas form directly in the heart muscle. Over time, these can scar the heart tissue, disrupt its electrical system, and cause abnormal heart rhythms. Symptoms include chest pain, palpitations, dizziness, and shortness of breath. Because the heart’s electrical signals can be blocked by inflammation or scar tissue, the heart may beat out of sync, sometimes dangerously so.
Sjögren’s Syndrome
Sjögren’s syndrome is most associated with dry eyes and dry mouth, but it has a pulmonary side that’s often overlooked. About 11% of patients with primary Sjögren’s syndrome report chest pain as part of lung involvement. The lungs can develop bronchiectasis (permanent widening and damage of the airways), bronchiolitis, or airway hyperreactivity. Up to 10% of Sjögren’s patients develop bronchiectasis, typically in the lower portions of the lungs, which causes coughing, mucus production, and sometimes chest discomfort.
Giant Cell Arteritis and Aorta Inflammation
Giant cell arteritis is an autoimmune condition that inflames blood vessel walls, and when it targets the aorta (the body’s largest artery), it can cause significant chest pain. In one study, 32% of giant cell arteritis patients with aortitis had symptoms at diagnosis, and among those, 51% reported chest pain. This type of chest pain tends to be deep, persistent, and not clearly linked to breathing or position. The concern is that aorta inflammation can weaken the vessel wall over time, increasing the risk of aortic aneurysm or dissection. Patients with symptomatic aortitis at diagnosis appear to represent a higher-risk group for these complications.
How Autoimmune Chest Pain Differs From a Heart Attack
Autoimmune chest pain, particularly from pleurisy or pericarditis, has characteristics that set it apart from heart attack pain. Pleuritic pain is sharp and localized, and it gets noticeably worse when you breathe in, cough, or sneeze. Pericarditis pain worsens when lying down and improves when leaning forward. Heart attack pain, by contrast, tends to be a crushing or squeezing sensation that may radiate to the arm or neck and is often accompanied by nausea, sweating, vomiting, or a racing heart.
There’s one useful physical test clinicians use: if the pain persists while you hold your breath, it’s more likely pericarditis than pleurisy. A pericardial friction rub (a scratchy sound heard through a stethoscope) continues even when breathing stops, while a pleural friction rub disappears. Nonspecific symptoms like joint pain, weight loss, and night sweats alongside chest pain can point toward an autoimmune or inflammatory cause rather than a purely cardiac one.
How Autoimmune Chest Pain Is Evaluated
When an autoimmune cause is suspected, evaluation typically starts with a chest X-ray and blood work looking for inflammation markers and autoimmune antibodies. An echocardiogram (ultrasound of the heart) is the first-line tool for checking pericardial fluid, valve problems, and how well the heart is pumping. It’s noninvasive, widely available, and can detect many of the cardiac complications autoimmune diseases cause.
If more detail is needed, CT scans can reveal lung scarring, enlarged lymph nodes, or inflammation of the aorta. Cardiac MRI is particularly useful for detecting myocarditis, as it can identify areas of inflammation and scarring in the heart muscle that echocardiography might miss. For suspected coronary artery involvement, nuclear imaging can map blood flow through the heart at rest and during stress. The specific tests ordered depend on which autoimmune condition is involved and what type of chest pain you’re experiencing, so providing your doctor with a clear description of the pain (when it started, what makes it worse, what makes it better) helps narrow the workup considerably.