A portable monitoring device comprises a hearing aid having a housing, atleast one microphone for receiving ambient sound, acoustic signal processingmeans forprocessing a signal from the microphone, and an acoustic output transducer.The monitoringdevice further comprises an EEG monitoring system for monitoring EEG signalsof a personusing the portable monitoring device, said EEG monitoring system beingarranged at leastpartly in said housing, said EEG monitoring system comprising a measuring unithavingelectrodes for measuring one or more EEG signals from the person carrying theEEGmonitor, said electrodes being arranged external to the housing or at theouter surface of thehousing. The monitoring system is adapted for, based on the EEG signal,identifying orpredicting specific biological incidences, such as a seizure, in said person,and for providingan alarm through said output transducer. The invention further provides amethod ofmonitoring an EEG signal.
