What Is Sarcoidosis Of The Lung Symptoms Treatment?

Sarcoidosis of the lung is an inflammatory disease that causes small clumps of immune cells called granulomas to form in lung tissue. These granulomas can interfere with how the lungs work and lead to symptoms like a dry cough, shortness of breath, chest tightness, and fatigue. Treatment depends on symptom severity; many people improve without any treatment, while others benefit from corticosteroids or other medications that calm the immune system.

What Is Sarcoidosis of the Lung?

Pulmonary sarcoidosis is the most common form of sarcoidosis, a disease where the immune system overreacts and forms granulomas in various organs. In the lungs, these granulomas most often appear in the air sacs and the lymph nodes around the airways. Over time, they can cause scarring, known as fibrosis, in a small number of people. The disease can range from mild and temporary to chronic and progressive.

Sarcoidosis is not cancer and is not contagious. It affects people of all backgrounds but is more common in certain groups, particularly African Americans and people of Northern European descent. The exact reason some people develop it and others do not remains unknown.

What Causes Pulmonary Sarcoidosis?

The cause of pulmonary sarcoidosis is not fully understood. Most researchers believe it results from an abnormal immune response to an environmental trigger in a person who is genetically predisposed. Potential triggers that have been studied include bacteria, viruses, and inhaled particles such as mold or dust, but no single cause has been proven.

What is clear is that the immune system overreacts. Certain immune cells cluster together and form granulomas. In many people, these granulomas disappear on their own. In others, they persist and cause ongoing inflammation and tissue damage. There is no evidence that sarcoidosis spreads from person to person, so it is not considered an infectious disease.

What Are the Symptoms of Lung Sarcoidosis?

Many people with pulmonary sarcoidosis have no symptoms at all. When symptoms do occur, they often develop gradually. The most common symptoms include a dry cough that does not go away, shortness of breath, especially with activity, and chest discomfort or tightness. Fatigue is also very common and can be the most troublesome symptom for some people.

Other symptoms that are not specifically lung-related can happen because sarcoidosis may affect other organs. These include fevers, night sweats, weight loss, swollen lymph nodes, skin rashes, and joint pain. Some people experience a condition called erythema nodosum, which causes tender red bumps on the shins. This combination of symptoms plus chest imaging findings is often a clue that leads to the diagnosis.

In a small number of cases, the lung inflammation becomes severe enough to cause significant scarring, leading to permanent shortness of breath and a reduced ability to exercise.

How Is Pulmonary Sarcoidosis Diagnosed?

There is no single test that can diagnose sarcoidosis. Instead, doctors rely on a combination of findings and rule out other conditions that can look similar. A chest X-ray or CT scan is usually the first step. Typical findings include enlarged lymph nodes at the center of the chest, called bilateral hilar lymphadenopathy, and small nodules scattered through the lungs.

If imaging suggests sarcoidosis, doctors often do a biopsy to confirm it. A biopsy involves taking a small sample of lung tissue, usually through a bronchoscope passed down the throat, and examining it under a microscope. The presence of non-caseating granulomas supports the diagnosis. Blood tests and pulmonary function tests help measure the extent of the disease and check for involvement of other organs.

Doctors also need to rule out infections like tuberculosis, fungal lung disease, and other inflammatory conditions such as hypersensitivity pneumonitis. This step is essential because the treatments for sarcoidosis suppress the immune system, which can make an infection much worse.

What Are the Treatment Options for Pulmonary Sarcoidosis?

Not everyone with pulmonary sarcoidosis needs treatment. Up to two-thirds of people improve without medication within a few years. Doctors usually recommend treatment only when symptoms are significant, lung function is declining, or the disease is damaging organs.

When treatment is needed, corticosteroids are the first-line therapy. Prednisone is the most common medication used. It helps reduce inflammation and shrink granulomas. However, long-term steroid use can cause side effects including weight gain, high blood sugar, osteoporosis, and increased risk of infections.

For people who cannot tolerate steroids or do not respond well, other medications that suppress the immune system may be used. These include methotrexate, azathioprine, and mycophenolate mofetil. More recently, biologic drugs like infliximab have been used in severe cases, though evidence for their benefit is less consistent. The choice of medication depends on the individual’s symptoms, other health conditions, and the organs involved. Treatment is often adjusted over time based on response and side effects.

In advanced cases with extensive lung scarring, supplemental oxygen may be needed. Lung transplantation is considered only for end-stage disease that no longer responds to medical therapy.

No medication has been proven to cure sarcoidosis. The goal of treatment is to control symptoms, preserve lung function, and improve quality of life.

What Is the Outlook for People With Pulmonary Sarcoidosis?

The outlook is generally good. Many people with pulmonary sarcoidosis have a mild form that resolves on its own within one to three years. This is often called acute sarcoidosis. In these cases, no treatment is needed, and the disease rarely comes back.

About 20 to 30 percent of people develop chronic sarcoidosis, where symptoms and inflammation persist for years. Some of these individuals develop lung scarring that can be progressive. Even in chronic sarcoidosis, most people can manage their condition with treatment and maintain normal activity levels. However, quality of life can be affected by ongoing fatigue and breathlessness.

Sarcoidosis is rarely fatal, but deaths do occur, mainly from advanced lung fibrosis, heart involvement, or complications from treatment. The risk of serious outcomes is higher in African Americans and in people with more extensive disease at diagnosis.