Causes - Sarcoidosis
Sarcoidosis is a condition in which immune cells form lumps, called granulomas, in your organs.is thought to cause granulomas to form and may lead to temporary or permanent scarring at the site of the granulomas. Your genes or certain environmental factors may trigger the inflammation that leads to granulomas.
Recent studies suggest that people get sarcoidosis because of genes that make you susceptible to the disease. Some of the genes that are related to sarcoidosis are associated with the.
Environmental factors, such as infection or exposure to certain substances, can trigger changes in the immune system and lead to sarcoidosis. Studies suggest that these triggers may cause sarcoidosis only in people with genes that make them susceptible to the disease.
- Treatment will discuss heart-healthy lifestyle changes that your doctors may recommend if you are diagnosed with sarcoidosis.
Risk Factors - Sarcoidosis
You may have an increased risk for sarcoidosis because of your age, your family history and genetics, or your race. Some risk factors, such as occupation, can be changed. Most risk factors, such as age, family history and genetics, race and ethnicity, and sex, cannot be changed.
You can be diagnosed with sarcoidosis at any age, but sarcoidosis is most commonly diagnosed in people age 55 and older.
Environment or occupation
Your risk for sarcoidosis may be higher if you have repeated exposure to environmental substances that cause inflammation, such as insecticides or mold, or if you work in health care or as a firefighter. Working in these occupations may expose you to substances that trigger the formation of granulomas.
Family history and genetics
You have a higher risk of sarcoidosis if you have a close relative with sarcoidosis.
Other medical conditions
Sarcoidosis sometimes occurs after lymphoma, a type of blood cancer.
Race or ethnicity
People of any race can get sarcoidosis, but it is more common in people of African or Scandinavian descent.
Both men and women can develop sarcoidosis, but it is more common in women.
Screening and Prevention - Sarcoidosis
Currently, there are no screening methods to determine who will develop sarcoidosis. If you are at risk for sarcoidosis, your doctor may recommend you try to avoid insecticides, mold, or other environmental sources of substances known to trigger the formation of granulomas.
- Diagnosis will discuss tests and procedures that your doctor may use to diagnose types of sarcoidosis.
- Living With will explain what your doctor may recommend to prevent sarcoidosis from recurring, getting worse, or causing complications.
- Research for Your Health will discuss how we are using current research and advancing research to prevent sarcoidosis.
- Participate in NHLBI Clinical Trials will explain our ongoing clinical studies that are investigating prevention strategies for sarcoidosis.
Signs, Symptoms, and Complications - Sarcoidosis
Many people who have sarcoidosis have noor . Some people experience general signs and symptoms of sarcoidosis such as fever and weight loss. Others will experience signs and symptoms that will depend on which organs are affected. If inflammation continues, some people may develop permanent scarring, which can lead to life-threatening serious heart or lung complications.
Signs and symptoms
Many people have general signs and symptoms, such as:
- Malaise, or a feeling of discomfort or illness
- Pain and swelling in the joints
- Weight loss
Sarcoidosis most often affects the lungs and the cough, feel short of breath, or have chest pain. However, people with sarcoidosis in the lungs do not always have lung-related symptoms.in the chest. Some people with sarcoidosis in the lungs may wheeze,
If sarcoidosis affects other organs or parts of your body, you may have other symptoms related to those organs:
- Abdominal pain
- A larger than normal spleen
- Burning, itchy, or dry eyes
- Heart palpitations
- Joint pain
- Muscle weakness
- Problems with a liver that is larger than normal, including itching, vomiting, nausea, jaundice, or abdominal pain
- Problems with the nervous system, including headache, dizziness, vision problems, seizures, mood swings, disturbed behavior, hallucinations, delusions, back pain, or pain associated with particular nerves
- Skin changes, including or lupus pernio, a condition that causes skin sores that usually affect the face, especially the nose, cheeks, lips, and ears. The sores associated with lupus pernio tend to last a long time. Lupus pernio occurs mostly in African Americans and can return after sarcoidosis treatment is over.
- Swelling of the salivary glands
- Swollen or tender lymph nodes in other areas of the body besides the chest, such as in your neck, chin, armpits, or groin
Did you know Lofgren’s syndrome is a classic set of signs and symptoms of sarcoidosis?
If sarcoidosis is untreated or if the treatment does not work, inflammation can continue and scarring may develop. Sarcoidosis can cause serious and life-threatening damage to the organs it affects, including:
- Blood and bone marrow problems, including lower-than-usual numbers of red or white blood cells
- Endocrine conditions, including hypercalcemia, diabetes insipidus, and amenorrhea
- Heart complications, including arrhythmia, heart failure, sudden cardiac arrest, cardiomyopathy
- Kidney conditions, such as kidney stones or kidney failure
- Lung diseases, such as pulmonary hypertension and pulmonary fibrosis
- Problems with the nervous system, including brain tumors, meningitis, hydrocephalus, psychiatric problems, and nerve pain
Diagnosis - Sarcoidosis
Your doctor will diagnose sarcoidosis based on your symptoms, a physical exam, imaging tests, or a biopsy of an affected organ. The doctor will also perform tests to rule out other diseases that have similar signs and symptoms.
Diagnostic tests and procedures
To diagnose sarcoidosis and determine which organs are affected, your doctor may have you undergo some of the following tests and procedures:
- of the lungs, liver, skin, or other affected organs to check for granulomas
- Blood tests, including complete blood counts, to check hormone levels and to test for other conditions that may cause sarcoidosis
- Bronchoscopy, which may include rinsing an area of the lung to get cells or using a needle to take cells from the lymph nodes in the chest
- Chest X-ray to look for granulomas in the lungs and heart and determine the stage of the disease. Often, sarcoidosis is found because a chest X-ray is performed for another reason.
- Neurological tests, such as electromyography, evoked potentials, spinal taps, or nerve conduction tests, to detect problems with the nervous system caused by sarcoidosis
- Eye exam to look for eye damage, which can occur without symptoms in a person with sarcoidosis
- Gallium scan, which uses a radioactive material called gallium to look for inflammation, usually in the eyes or lymph nodes.
- High-resolution computed tomography (CT) scan to look for granulomas
- Magnetic resonance imaging (MRI) to help find granulomas. Learn more in our Chest MRI Health Topic.
- Positron electron tomography (PET) scan, a type of imaging that can help find granulomas
- Pulmonary function tests to check whether you have breathing problems
- Ultrasound to look for granulomas
Tests for other medical conditions
To help diagnose sarcoidosis, your doctor may need to perform tests or ask questions to rule out other medical conditions that have similar signs and symptoms as sarcoidosis.
- Blood tests to help the doctor distinguish between sarcoidosis and cancer or infections
- A bronchoscopy to find signs that may suggest an infection or cancer
- Questions about environmental exposure to help determine whether the granulomas are related to sarcoidosis or another condition. Exposure to beryllium, for example, can cause granulomas similar to sarcoidosis even though they are actually associated with chronic beryllium disease
- A urinalysis to help the doctor rule out other conditions that resemble sarcoidosis
Stages of sarcoidosis
Doctors use stages to describe the various imaging findings of sarcoidosis of the lung or lymph nodes of the chest. There are four stages of sarcoidosis, and they indicate where the granulomas are located. In each of the first three stages, sarcoidosis can range from mild to severe. Stage IV is the most severe and indicates permanent scarring in the lungs.
- Stage I: Granulomas are located only in the lymph nodes.
- Stage II: Granulomas are located in the lungs and lymph nodes.
- Stage III: Granulomas are located in the lungs only.
- Stage IV: Pulmonary fibrosis.
Treatment - Sarcoidosis
The goal of treatment is remission, a state in which the condition is not causing problems. Not everyone who is diagnosed with sarcoidosis needs treatment. Sometimes the condition goes away on its own. Whether you need treatment—and what type you need—will depend on your signs and symptoms, which organs are affected, and whether those organs are working well. Some people do not respond to treatment.
Because inflammation is thought to be involved in sarcoidosis, your doctor may prescribe medicines to reduce inflammation or treat an overactive immune system that may be causing too much inflammation in the body. Some of the medicines include:
- Corticosteroids to reduce inflammation. The corticosteroid prednisone is the most commonly used treatment for sarcoidosis. Corticosteroids can be taken as pills or be injected, inhaled, or taken as eye drops or other topical medicines. Corticosteroids can have serious side effects with long-term use.
- Disease-modifying antirheumatic drugs (DMARDs) to treat an overactive immune system. Examples of DMARDs include methotrexate, azathioprine, and leflunomide. Potential side effects include liver damage.
- Monoclonal antibodies to treat an overactive immune system. Examples include infliximab, adalimumab, rituximab, and golimumab.
- Antibiotics to treat sarcoidosis of the skin. Side effects of common antibiotics, such as minocycline, tetracycline, and doxycycline, include dizziness and gastrointestinal problems.
- Antimalarials to treat sarcoidosis of the skin, lungs, or nervous system. These medicines are typically used to fight malaria. Side effects include eye damage.
- Colchicine to treat joint pain from sarcoidosis. This medicine is usually prescribed for gout. Side effects include nausea, vomiting, diarrhea, and stomach cramps or pain.
- Corticotropin to treat an overactive immune system. This is a type of therapy. Side effects include changes to appetite or mood.
- Pentoxifylline to block the release of TNF-a, a substance in white blood cells that can cause granulomas. This medicine is normally prescribed to improve blood flow. Side effects include nausea.
- Living With will explain what your doctor may recommend, including lifelong lifestyle changes and medical care to prevent your condition from recurring, getting worse, or causing complications.
- Research for Your Health will discuss how we are using current research and advancing research to treat people with sarcoidosis.
- Participate in NHLBI Clinical Trials will explain our ongoing clinical studies that are investigating treatments for sarcoidosis.
Living With - Sarcoidosis
If you have been diagnosed with sarcoidosis, it is important that you continue your medicine, follow up with your doctor when directed, make healthy lifestyle changes, and prevent complications. Some people may achieve total, or life-long, remission. Other people may achieve temporary remission and go on to experience a relapse, or return of the disease. If you are pregnant, talk to your doctor about the medicines you take to avoid problems for you and your baby.
Receive routine follow-up care
How often you need to see your doctor will depend on the severity of your symptoms, which organs are affected, which treatments you are using, and whether you have any side effects from treatment. Even if you do not have symptoms, you should see your doctor for ongoing care.
Return to Treatment to review possible treatment options for sarcoidosis.
Monitor your condition
If the disease is not worsening, your doctor may watch you closely to see whether the disease goes away on its own. If the disease does start to get worse, your doctor can prescribe treatment.
Some people have sarcoidosis that persists or recurs for many years after diagnosis. This may be called chronic, severe, advanced, refractory, or progressive sarcoidosis. To monitor your condition, your doctor may recommend the following tests at regular intervals.
- A chest X-ray to monitor your lungs for permanent scarring, also known as pulmonary fibrosis.
- An eye exam to detect eye damage. See an eye doctor every year. Sarcoidosis can cause permanent eye damage without symptoms.
- Heart tests to monitor how well your heart is working. Sarcoidosis only rarely affects the heart, but cardiac sarcoidosis may be life threatening. Tests may include electrocardiography (ECG or EKG), echocardiography, or cardiac MRI.
- Liver function tests to determine if your liver is working the way that it should. These tests are particularly important if you have liver sarcoidosis. You may need treatment for cholestasis, which is a type of liver disease that causes severe itching without a rash.
- Pulmonary function tests to monitor how sarcoidosis is affecting your lungs over time. If your lung function worsens, you may need different treatment.
Your doctor may perform other tests based on which organs are involved and what medicine is prescribed. For example, your doctor will monitor you for side effects of corticosteroids, such as osteoporosis, if used long term.
Adopt healthy lifestyle changes
Your doctor may recommend that you adopt lifelong lifestyle changes to help prevent sarcoidosis from worsening if you do not need medicine. These may include:
- Heart-healthy eating
- Aiming for a healthy weight
- Being physically active. Even though fatigue can make it hard to exercise if you have sarcoidosis, physical activity can actually improve energy and help with other symptoms, such as shortness of breath and muscle weakness. Try to stay as active as you can, but talk to your doctor first about an exercise program that is appropriate for you.
- Managing stress
- Quitting smoking. If you smoke, quit. Also, try to avoid other lung irritants, such as dust, chemicals, and secondhand smoke. Visit Smoking and Your Heart and the National Heart, Lung, and Blood Institute's Your Guide to a Healthy Heart [PDF, 2.2 MB]. For free help quitting smoking, you may call the National Cancer Institute's Smoking Quitline at 1-877-44U-QUIT (1-877-448-7848).
Prevent a relapse
If your sarcoidosis goes into remission, your doctor may carefully stop your medicines. However, he or she will still need to monitor you for a relapse, also called a flare, of the disease.
Relapses can be hard to predict. Most people who relapse do so in the first six months after stopping treatment. The longer you go without symptoms, the less likely you are to have a relapse.
See your doctor if you have a relapse. You may need a second round of treatment.
Prevent and treat complications over your lifetime
To help prevent some of the complications of sarcoidosis, your doctor may recommend the following:
- An implantable cardioverter defibrillator that may help prevent sudden cardiac arrest.
- Surgery if sarcoidosis has damaged organs or you are at risk for serious or life-threatening health problems. Surgery can include a heart, lung, or liver transplant, or treatment for complications in the brain.
- Lifestyle changes if you have hypercalcemia, which means your body has problems absorbing calcium. This can lead to high levels of calcium in your blood and urine. Your doctor may recommend avoiding sunlight, drinking plenty of fluids, and eating fewer foods with calcium.
Other treatments may be used to treat organs that are less commonly affected.
- Anti-epileptic medicines if sarcoidosis affects your brain and causes seizures
- Eye drops
- Hormone replacement therapy if sarcoidosis causes endocrine problems
- Medicines for nerve pain
- Nonsteroidal anti-inflammatory drugs (NSAIDs)
- Physical therapy
- Vasodilator therapy to relax your blood vessels. This may be necessary if your sarcoidosis causes pulmonary hypertension.
Learn the warning signs of serious complications and have a plan
Watch for the warning signs of complications that may require emergency medical treatment. These include signs of blindness or brain tumors, such as changes in your vision or if you cannot see clearly or see color. Other complications that require immediate medical attention include kidney failure, sudden cardiac arrest, and sudden shortness of breath or muscle weakness.
Sarcoidosis may make you feel socially isolated, anxious, or depressed, and you may continue to feel fatigued even after your treatment has ended. But certain activities or treatments may help improve your emotional health.
- Counseling, particularly cognitive therapy, can be helpful.
- Joining a patient support group, which may help you adjust to living with sarcoidosis. You can see how other people who have the same symptoms have coped with them. Talk with your doctor about local support groups or check with an area medical center.
- Medicines or other treatments. Your doctor may recommend medicines, such as antidepressants, or other treatments that can improve your quality of life.
- Support from family and friends can help relieve stress and anxiety. Let your loved ones know how you feel and what they can do to help you.
If you have sarcoidosis and are pregnant or planning to become pregnant, talk with your doctor about the risks involved. Also, if you become pregnant, it is important to get good prenatal care and regular sarcoidosis checkups during and after pregnancy.
Most women who have sarcoidosis give birth to healthy babies. Women with sarcoidosis are at risk for some complications related to pregnancy, including:
- Hemorrhaging after giving birth
- Preterm delivery
- Venous thromboembolism, such as pulmonary embolism and deep vein thrombosis
Talk to your doctor about any medicines you take. Some medicines prescribed to adults with sarcoidosis are not safe to take during pregnancy.
Research for Your Health
Improving health with current research
Learn about the following ways the NHLBI continues to translate current research into improved health for people with sarcoidosis.
- NHLBI research workshops to understand sarcoidosis risk factors and prevalence. We held workshops in 2008 and 2015 for researchers to come together, discuss the causes and risk factors for sarcoidosis, and assess the need for further research on the condition.
- A trans-NIH sarcoidosis working group supported by NHLBI. Beginning in 2004, we participated in a Trans-NIH Sarcoidosis Working Group that met once a year to share and coordinate research into causes, risk factors, genetic underpinnings, and the potential for treatments for sarcoidosis.
Learn about some of the pioneering research contributions we have made over the years that have improved clinical care.
- NHLBI’s Specialized Center of Research in Occupational and Immunologic Lung Disease. Our Center collected data that have helped us control and prevent acute and chronic lung damage due to inhalation of environmental and occupational agents. Visit the Specialized Center of Research in Occupational and Immunologic Lung Disease for more information.
- A Case-Control Etiologic Study of Sarcoidosis (ACCESS). This NHLBI study began in 1997 and enrolled more than 700 people with sarcoidosis. ACCESS discovered new information about how sarcoidosis can have different symptoms and complications in people of different races and sexes and that sarcoidosis often runs in families,
- Sarcoidosis Genetic Analysis (SAGA). Our SAGA study enrolled more than 500 pairs of siblings with sarcoidosis. The researchers found genes that affect the risk of sarcoidosis.
Advancing research for improved health
In support of our mission, we are committed to advancing sarcoidosis research in part through the following ways.
- We perform research. Our Division of Intramural Research, which includes investigators in our Pulmonary Branch, performs research on lung disorders that cause lung scarring, such as sarcoidosis.
- We fund research. The research we fund today will help improve our future health. Our Division of Lung Diseases, specifically the Interstitial Lung Disease/Fibrosis Program in the Lung Biology and Disease Branch, oversees research we fund on interstitial lung diseases, including sarcoidosis. Search the NIH RePORTER to learn about research the NHLBI is funding on sarcoidosis.
- We stimulate high-impact research. Our Trans-Omics for Precision Medicine (TOPMed) program includes participants with sarcoidosis, which may help us understand how genes contribute to differences in disease severity and how patients respond to treatment. The program also has the potential to help find new ways to prevent or treat the disease in African Americans, who are affected more often and more severely than whites. The NHLBI Strategic Vision highlights ways we may support research over the next decade.
Learn about exciting research areas the NHLBI is exploring about sarcoidosis.
- Can antibiotics help people with sarcoidosis? Researchers are testing whether a combination of four antibiotics can help people with sarcoidosis breathe better.
- Could a statin help people with sarcoidosis? Atorvastatin, a medicine that is commonly used to lower cholesterol, is being tested for effectiveness against sarcoidosis.
- Does Helicobacter pylori play a role in sarcoidosis? Researchers are investigating whether Helicobacter pylori, a microorganism known to cause stomach ulcers, also plays a role in sarcoidosis and other lung diseases.
- How does a person’s genes and environment affect his or her risk of developing sarcoidosis? Researchers are investigating what genes are involved with sarcoidosis and how the interplay of genes and environment may increase the risk for some people.
- What is the relationship between microbes in the lungs and sarcoidosis? The Genomic Research in Alpha-1 Antitrypsin Deficiency and Sarcoidosis (GRADS) study is a national, coordinated effort to study the link between microbes in the lungs and whether it may contribute to sarcoidosis or other lung diseases. The results of GRADS will be an important step towards personalized treatment of chronic lung diseases.
Participate in NHLBI Clinical Trials
We lead or sponsor many studies on sarcoidosis. See if you or someone you know is eligible to participate in our.
Trials at the NIH Clinical Center
Genes involved in development of lung diseases
To learn more about clinical trials at the NIH Clinical Center or to talk to someone about a study that might fit your needs, call the Office of Patient Recruitment 800-411-1222.
Are you an adult with sarcoidosis who does not smoke or use other nicotine products?
After reading our Sarcoidosis Health Topic, you may be interested in additional information found in the following resources.