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An improvement in symptoms with the use of nonsteroidal anti-inflammatory drugs (NSAIDs) is indicative of inflammatory rather than mechanical back pain in spondyloarthritis.

Gastrointestinal conditions like Crohn’s disease and ulcerative colitis are associated with spondyloarthritis.

An inflammation of the uvea, the middle layer of the eye, which can be associated with spondyloarthritis, especially ankylosing spondylitis.

Inflammation in few joints (typically 4 or fewer), frequently seen in the early stages of spondyloarthritis.

Stiffness in the back or joints that lasts for more than 30 minutes after awakening, frequently seen in spondyloarthritis.

Alterations in the appearance of nails such as pitting, ridging or thickening, observed in psoriatic arthritis.

Increased levels of CRP can indicate systemic inflammation and is seen in some patients with spondyloarthritis.

Chronic pain and stiffness in the lower back, buttocks, and hips that occurs in ankylosing spondylitis and other forms of spondyloarthritis.

Uneven distribution of inflammation in joints, often seen in psoriatic arthritis and other types of spondyloarthritis.

The occurrence of painful sores in the genital region can be a feature of reactive arthritis, a subtype of spondyloarthritis.

Persistent tiredness that is not relieved by rest, often accompanying the systemic inflammation in spondyloarthritis.

Inflammation of one or both of the sacroiliac joints, found in ankylosing spondylitis and other spondyloarthritis.

A genetic marker associated with increased risk for various types of spondyloarthritis, including ankylosing spondylitis.

Decreased range of motion in the spine due to inflammation and, eventually, fusion of the vertebrae in ankylosing spondylitis.

Pain at the back of the heel, often due to enthesitis at the Achilles tendon insertion, associated with spondyloarthritis.

A skin condition producing red patches with silvery scales, commonly associated with psoriatic arthritis, a subset of spondyloarthritis.

Inflammation of entheses, the sites where ligaments or tendons insert into the bone, commonly seen in spondyloarthritis.

Swelling of an entire digit (finger or toe), giving it a sausage-like appearance, often found in psoriatic arthritis, a type of spondyloarthritis.

Onset of spondyloarthritis symptoms before age 16, observed in juvenile spondyloarthritis.