Rheumatologists treat more than 100 autoimmune and inflammatory conditions, most of which involve the immune system mistakenly attacking healthy tissue. The specialty covers everything from common diseases like rheumatoid arthritis and lupus to rarer conditions like vasculitis, where inflammation damages blood vessels throughout the body. If your primary care doctor suspects an autoimmune process is behind your symptoms, a rheumatologist is typically the specialist you’ll be referred to.
Rheumatoid Arthritis
Rheumatoid arthritis (RA) is one of the most common reasons people end up in a rheumatologist’s office. Unlike osteoarthritis, which results from wear and tear on cartilage, RA is driven by an immune system that attacks the lining of the joints. This causes pain, swelling, and stiffness in multiple joints, often symmetrically (both wrists, both knees). A hallmark sign is morning stiffness lasting longer than 30 to 60 minutes, sometimes for hours. In osteoarthritis, that stiffness usually fades within 5 to 10 minutes.
Diagnosis often involves blood tests for two key markers. CCP antibodies are found in most people with RA and are almost never present in people without the disease. Rheumatoid factor (RF) is less specific; it can show up in other autoimmune conditions and even in some healthy people. When both tests are positive, RA is very likely. When CCP antibodies are positive but RF is negative, it can signal early-stage RA or a high likelihood of developing it.
Systemic Lupus Erythematosus
Lupus is a systemic autoimmune disease, meaning it can affect nearly any organ. The immune system produces proteins called autoantibodies that target healthy tissues throughout the body. Symptoms vary widely from person to person but commonly include joint pain, skin rashes (particularly a butterfly-shaped rash across the cheeks), hair loss, mouth ulcers, and fatigue. More serious involvement can include kidney inflammation, fluid around the heart or lungs, seizures, and drops in blood cell counts.
Because lupus mimics so many other conditions, diagnosis can take time. Rheumatologists look for a combination of clinical signs and blood markers. A positive antinuclear antibody (ANA) test is typically the starting point, but ANA alone doesn’t confirm lupus since it can be positive in other conditions and even in healthy individuals. More specific antibodies, along with a pattern of symptoms across multiple organ systems, help solidify the diagnosis. Kidney involvement, when present, carries the most weight in determining severity.
Psoriatic Arthritis
About 30% of people with psoriasis eventually develop psoriatic arthritis, an inflammatory joint disease that can range from mild to severely destructive. It causes joint pain, swelling, and stiffness, and it often affects the fingers and toes, sometimes causing them to swell into a “sausage-like” shape. Morning stiffness, as with RA, tends to last 30 minutes or longer. Some people develop psoriatic arthritis before they ever notice skin symptoms, which can make early diagnosis tricky.
Ankylosing Spondylitis
Ankylosing spondylitis (AS) primarily targets the spine and the joints connecting the spine to the pelvis. Early symptoms include lower back pain and stiffness that worsen in the morning or after long periods of sitting, then improve with movement. Neck pain, fatigue, eye pain, and skin rashes can also occur. Over time, chronic inflammation can cause sections of the spine to fuse, reducing flexibility.
A gene called HLA-B27 significantly increases the risk of developing AS, though not everyone who carries the gene gets the disease, and not everyone with AS has it. Back pain lasting more than three months with morning stiffness lasting up to three hours is a typical pattern that prompts evaluation. Rheumatologists also manage related conditions in the same family, collectively called spondyloarthropathies, which can involve inflammation where tendons and ligaments attach to bone, particularly along the spine and heel.
Sjögren’s Syndrome
Sjögren’s syndrome targets the glands that produce moisture, leading to two signature symptoms: persistently dry eyes that burn or feel gritty, and a dry mouth so severe it can make swallowing or speaking difficult. Beyond dryness, many people also experience joint pain and swelling, skin rashes, a chronic dry cough, vaginal dryness, and deep fatigue. Sjögren’s can occur on its own or alongside other autoimmune conditions like RA or lupus.
Scleroderma
Scleroderma, also called systemic sclerosis, involves the overproduction of collagen, leading to thickening and hardening of the skin. In its systemic form, it can also affect blood vessels and internal organs, including the lungs, kidneys, and digestive tract. Raynaud’s phenomenon, where fingers turn white or blue in response to cold or stress, is often one of the earliest signs. Rheumatologists coordinate care for scleroderma since it frequently requires involvement from lung specialists, kidney specialists, and gastroenterologists as well.
Vasculitis
Vasculitis refers to a group of conditions in which the immune system inflames and damages blood vessels. These are classified by the size of the vessels involved. Large vessel types include giant cell arteritis, which causes headaches, scalp tenderness, jaw pain, and vision problems, and Takayasu arteritis, which affects the aorta and its major branches. Medium vessel types include polyarteritis nodosa. Small vessel types include several conditions grouped under ANCA-associated vasculitis, such as granulomatosis with polyangiitis (GPA) and microscopic polyangiitis (MPA), which can affect the kidneys, lungs, and sinuses.
Vasculitis symptoms depend entirely on which blood vessels are involved, making these conditions notoriously difficult to diagnose. Rheumatologists often work alongside nephrologists and pulmonologists when organs are affected.
Other Conditions Rheumatologists Manage
Several additional conditions fall under the rheumatology umbrella:
- Polymyalgia rheumatica (PMR): causes muscle pain and stiffness in the shoulders, upper arms, hips, and neck. It’s closely linked to giant cell arteritis and primarily affects people over 50.
- Gout: caused by a buildup of uric acid crystals in the joints, leading to sudden, intense episodes of pain and swelling, most often in the big toe. While not classically “autoimmune,” it falls within rheumatology because it involves inflammatory joint disease.
- Reactive arthritis: joint pain and swelling triggered by an infection elsewhere in the body, sometimes accompanied by red eyes and urinary tract inflammation.
- Juvenile arthritis: a group of autoimmune joint diseases that develop in children, managed by pediatric rheumatologists.
- Myositis: inflammatory diseases that attack the muscles, causing progressive weakness.
- Antiphospholipid syndrome: an autoimmune clotting disorder that increases the risk of blood clots and pregnancy complications, frequently seen alongside lupus.
How Rheumatologists Treat These Conditions
The treatment approach for most autoimmune diseases managed by rheumatologists centers on controlling the immune system to reduce inflammation and prevent organ damage. There are two main categories of medication. Traditional disease-modifying drugs work broadly across the immune system and are typically taken as pills. These are usually tried first because they tend to cause fewer side effects. Methotrexate and hydroxychloroquine are among the most commonly prescribed in this group.
If traditional options aren’t enough, rheumatologists move to biologics, which are engineered proteins that target specific parts of the immune system rather than suppressing it broadly. These are generally more effective but carry a higher risk of side effects. Biologics are delivered either through an IV infusion at a clinic or as a self-injection you give yourself at home. Different biologics target different immune pathways: some block inflammatory signaling molecules, others reduce the activity of specific immune cells. The choice depends on which disease is being treated and how your body responds.
Treatment plans are highly individualized. Many people cycle through several medications before finding the right combination, and rheumatologists typically monitor blood work regularly to track both disease activity and medication side effects.