Psoriatic arthritis is an autoimmune disease, which means the body’s immune system turns on itself, in this case leading to inflammation of the joints. Most people who develop this type of arthritis also have the skin condition psoriasis, another autoimmune disease which causes raised red patches on the skin. More than 7 million people in the United States have psoriasis, and 30% of them may eventually develop psoriatic arthritis. Usually, people develop psoriasis before psoriatic arthritis, but some people may get the arthritis symptoms first.

Experts don’t know exactly what causes psoriatic arthritis, but many believe it’s likely a combination of a person’s genetics and environment. Most people develop symptoms for the first time when they’re between 30 and 50 years old, and both men and women can have the condition. Psoriatic arthritis is chronic and progressive, but medications and lifestyle changes may help.
Signs and symptoms of psoriatic arthritis

Many psoriatic arthritis symptoms closely resemble other types of arthritis, including osteoarthritis and rheumatoid arthritis. This is why psoriatic arthritis can be so difficult to diagnose. Symptoms can vary from person to person, but usually include painful, swollen, stiff joints. The joints may also be red or warm. Symptoms can come on suddenly or slowly, and be mild or severe. Many people have flares of psoriatic arthritis symptoms, followed by times of relative calm.

Psoriatic arthritis can affect different joints in the body. The small joints in the fingers and toes are often affected and may develop dactylitis, when the fingers and toes swell up. Many people also have pain in the lower back and the foot, such as the back of the heel. People who experience stiff joints often report that their symptoms are usually worse in the morning.

Nail changes are another classic symptom of psoriatic arthritis. These changes can include nail discoloration, nail beds that start separating, or pitting.

Many people with psoriatic arthritis also experience chronic fatigue. And some experience symptoms in an unexpected part of the body: the eyes. This can show up as conjunctivitis (pink eye) as well as pain and redness.

In severe cases, joints affected by psoriatic arthritis may become visibly deformed.

Symptoms:

Joints that are painful, red, warm, and/or swollen
Stiff joints, especially in the morning
Fatigue
Fingers and toes that are so swollen they look like sausages
Pain at the back of your heel (Achilles tendinitis)
Pain on the sole of your foot (plantar fasciitis)
Difficulty moving
Changes in the nails, which can become pitted or lift up from the nail bed
Conjunctivitis in the eye
Lower back pain

What causes psoriatic arthritis?

Experts aren’t sure what causes psoriatic arthritis, although they do know that having skin psoriasis is the biggest risk factor. As many as 30% of people with psoriasis go on to develop psoriatic arthritis. You may also be more likely to get psoriatic arthritis if you have skin psoriasis that affects your nails. About 80% of people with psoriatic arthritis have some kind of nail psoriasis.

Genetics is another risk factor. About 40% of people with psoriatic arthritis have a family member with psoriasis or another form of arthritis. But experts believe that environment can also play a role, and some think an infection such as strep throat may kick-start the immune system, causing psoriatic arthritis to then develop.

Those who were obese in their teens may also have a greater risk of developing psoriatic arthritis later. And although psoriatic arthritis can occur in childhood, most people are first diagnosed when they are between 30 and 50 years old.

What parts of the body does psoriatic arthritis affect?

 

Psoriatic arthritis tends to affect the distal joints (those closest to the nails) in the fingers and toes, although it can also affect the wrists, knees, ankles, elbows, neck, and lower back

There are five types of psoriatic arthritis, which are defined by which joints are affected, and how many. They include:

• Asymmetric oligoarticular psoriatic arthritis affects a joint on one side of the body but not always the counterpart on the other side. This form of psoriatic arthritis usually affects fewer than five joints. It is sometimes referred to as asymmetric psoriatic arthritis.

• Symmetric polyarthritis is the most common type of psoriatic arthritis, and affects the same joint on both sides of the body. Usually five or more joints are affected.

• Distal interphalangeal predominant psoriatic arthritis affects the body’s distal joints (those at the ends of the fingers or toes). Because these joints are close to the nails, symptoms can also include nail problems.

• Spondylitis affects the spine, as well as the joints in the lower back, neck, and sacroiliac joints (those between the sacrum and pelvis). In some people with spondylitis, joints in the legs, arms, feet, and hands are also affected.

Arthritis mutilans can seriously damage the hand and foot joints. It is the most severe—and rare—form of psoriatic arthritis.

Psoriatic arthritis pictures

Although psoriatic arthritis can affect any joint in your body, it’s often in the fingers and toes, the ankles, knees, wrists, lower back, or spine. In some people, psoriatic arthritis may involve just one or two joints, while other people may have five or more joints affected. In the fingers and toes, it’s often the joints nearest to the nails (distal joints) that are impacted. Fingers and toes can also swell up to look resemble sausages.

Typical nail symptoms include pitting, grooving, and changes in texture. Thickening of the nails, changes in color, and nails that lift up from the nail bed can also occur.

psa-symptoms-1

Psoriatic arthritis can be symmetrical (affecting joints on both sides of the body equally) or asymmetric (affecting a joint on one side only). The severity of the disease can vary even in joints right next to each other.

In severe cases, people with psoriatic arthritis can have deformities, such as clawed toes or ankles that roll inward.

psa-symptoms-2

Psoriatic arthritis can also cause conjunctivitis in the eyes.

How is psoriatic arthritis diagnosed?

There isn’t a test to diagnose psoriatic arthritis, and doctors instead look at medical history as well as a physical exam. The first question your doctor will probably ask you is whether or not you have skin psoriasis. Your doctor will want to know about your symptoms and which joints are painful or swollen.

Lab and imaging tests might help eliminate other conditions. While there is no blood test for psoriatic arthritis, there are blood tests that can eliminate other similar-seeming conditions, such as rheumatoid arthritis.

 

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Psoriatic arthritis is an autoimmune disease, which means the body’s immune system turns on itself, in this case leading to inflammation of the joints. Most people who develop this type of arthritis also have the skin condition psoriasis, another autoimmune disease which causes raised red patches on the skin....