High eosinophil suggests that there may be the following diseases: 1, bronchial asthma, urticaria and other allergic diseases; 2, roundworm, cysticercus and other parasitic infections; 3, eczema, psoriasis and other dermatological disorders; 4, the use of penicillin and other medications, as well as autoimmune diseases, such as systemic lupus erythematosus; 5, lymphomas of the blood system, leukemia, and metastatic tumors in other systems, etc.; when all of the above diseases are ruled out, and the eosinophils continue to increase for more than half a year, accompanied by the manifestations of multiple organ involvement, it is considered to be the idiopathic hyper eosinophilic syndrome.