<unk>  is inflammation of the entheses, the sites where tendons or ligaments insert into the bone. It is an enthesopathy, a pathologic condition of the entheses. Early clinical manifestations are an aching sensation akin to "working out too much", and it gets better with activity. It is worse in the morning (after sleeping and not moving). The muscle insertion hurts very focally as it joins into the bone, but there is little to no pain at all with passive motion. It is known to be associated with other autoimmune diseases, like spondyloarthropathies and psoriasis (thought to often precede psoriatic arthritis). A common autoimmune<unk>  is at the heel, where the Achilles tendon attaches to the calcaneus. There are some cases of isolated, primary<unk>  which are very poorly studied and understood. It is associated with HLA B27 arthropathies, such as ankylosing spondylitis, psoriatic arthritis, and reactive arthritis. Symptoms include multiple points of tenderness at the heel, tibial tuberosity, iliac crest, and other tendon insertion sites.
Enthesitis
Glossitis
Bursitis
Osteochondropathy
Facet joint arthrosis
Compression arthralgia
Osteoarthritis
Crystal arthropathy