Dysfunction in the sacroiliac joint, also called the SI joint, can sometimes cause lower back and/or leg pain. Leg pain from sacroiliac joint dysfunction can be particularly difficult to differentiate from radiating leg pain caused by a lumbar disc herniation (sciatica) as they can feel quite similar.
Systemic lupus erythematosus (SLE), also known simply as lupus, is an autoimmune disease in which the bodyâs immune system mistakenly attacks healthy tissue in many parts of the body. Symptoms vary between people and may be mild to severe.
Here are some key points about lupus. More detail and supporting information is in the main article. 1  Lupus is an autoimmune disease that can be mild or life threatening. 2  The most common forms of lupus are the milder forms, and most people with lupus enjoy a full life.3  More than 90% of lupus sufferers are women.ere are some key points about lupus. More detail and supporting information is in the main article. 1  Lupus is an autoimmune disease that can be mild or life threatening. 2  The most common forms of lupus are the milder forms, and most people with lupus enjoy a full life.