autoinflammation with episodic fever and lymphadenopathy (EFO_0010737, an Experimental Factor Ontology id) is an autosomal dominant immunologic disorder characterized by onset of recurrent episodes of unexplained fever beginning in early infancy. The episodes occur in a cyclic pattern with a frequency of every week or every few weeks and a duration of several days. Patients have accompanying lymphadenopathy, and some may have hepatosplenomegaly. Patient serum shows increased levels of inflammatory cytokines and chemokines, including IL6 and TNF, consistent with abnormal activation of the innate inflammatory system. Treatment with anti-IL6R antibodies may result in clinical improvement.