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.
There are several kinds of lupus: 1  Systemic lupus erythematosus (SLE) is the form of the disease that most people are referring to when they say âlupus.â The word âsystemicâ means the disease can affect many parts of the body. The symptoms of SLE may be mild or serious.