I sometimes have costochondritis, which is inflammation of the cartilage where the ribs attach to the breatbone. I often have enthesitis in my elbow with pain radiating down into my forearm. I also often have enthesitis in the back of my knee.
As RAHMBA said, enthesitis is a hallmark of AS. It is inflammation of tendons and ligaments where the attach to bone. Both men and women get enthesitis and costochondritis.
From what I have read, women are more likely to have peripheral issues than men.
Ginny - 57 year old female
Dx with USpA in March 2013; changed to AS in July 2015
Iritis and Scleritis
unicompartmental knee replacements: right-June 2014, left-Aug 2018
MTX, Humira, Cyclobenzaprine, plus Celebrex as needed
Supplements: Folic Acid, Vitamin A, Vitamin D, Calcium, Fish Oil, Culturelle probiotic, Melatonin (as needed)