Complications

Complications can occur if familial Mediterranean fever isn't treated. Complications can include:

• Abnormal protein in the blood. During attacks of familial Mediterranean fever, your body may produce an abnormal protein (amyloid A). The protein can accumulate in your body and cause organ damage (amyloidosis).
• Kidney damage. Amyloidosis can damage the kidneys, causing nephrotic syndrome. Nephrotic syndrome occurs when your kidneys' filtering systems (glomeruli) are damaged. People with this condition may lose large amounts of protein in their urine. Nephrotic syndrome can lead to blood clots in your kidneys (renal vein thrombosis) or kidney failure.
• Infertility in women. Inflammation caused by familial Mediterranean fever may also affect the female reproductive organs, causing infertility.
• Joint pain. Arthritis is common in people with familial Mediterranean fever. The most commonly affected joints are the knees, ankles, hips and elbows.