A persistent cold with green sputum suggests chronic sinusitis. Medical treatment with antibiotics and decongestants (perhaps with a course of corticosteroids) given for 4-6 weeks may cure the condition. However relapse may occur, and eventually nasal endoscopy and possibly surgical intervention by an ENT specialist will be needed. Eosinophilic elevation in the blood count suggests infection with parasites or a fungus. These are more likely to be a coincidental problems in the bowel, but sinus disease may be caused by such organisms. Other possibilities include hypersensitivity diseases or collagen vascular diseases. Usually these disorders cause severe illness, and a biopsy is needed to establish the diagnosis. These diseases will require steroid or immunosuppressive drug therapy.