My wife has a type of hypereosinophilia, it's called Gleich syndrome. It is a rare disorder. High wbc, high eos but with swelling in muscles of extremities, sometimes painful, sometimes not. It does not cause organ. It's basically episodic angioedema. Blood tests, mri's, ultrasounds, skin muscle biopsies and bone marrow biopsies were done. She takes prednisone for it.