Eosinophilic granulomatosis with polyangiitis (EGPA) is a systemic vasculitis characterised by bronchial asthma, hypereosinophilia, and systemic vasculitis. History of asthma with blood eosinophilia and multiorgan involvement are the important clues to suspect EGPA. In the original paper by Churg and Strauss cardiac, gastrointestinal tract, renal, and neurological involvement were noted more frequently. The pattern of neurological involvement may be mononeuritis multiplex, and symmetrical and asymmetrical polyneuropathy. Mononeuritis multiplex was present in 78.1% while cranial nerves were involved in only 4.1% of cases. Glucocorticosteroids and immunosuppressants, especially cyclophosphamide, have considerably improved the prognosis and overall survival rates in patients with systemic vasculitis, including eosinophilic granulomatosis with polyangiitis. The authors present a clinical case of eosinophilic granulomatosis with polyangiitis with severe mononeuritis multiplex. The case reflects the successful application of a cyclophosphamide regime as a remission inducer.