Symptoms of systemic lupus erythematosus are characterized by pronounced polymorphism, but almost 20% of children have monoorgan variants of the disease onset. The course of systemic lupus erythematosus is usually undulating, with alternating periods of exacerbations and remissions. In general, systemic lupus erythematosus in children is characterized by a more acute onset and course of the disease, earlier and more violent generalization, and a less favorable outcome than in adults.