Guba na Mercury wani nau'in guba ne na karfe saboda fallasa ga mercury. Alamun sun dogara da nau'in, kashi, hanya, da tsawon lokacin fallasa. Suna iya haɗawa da raunin tsoka, rashin daidaituwa, rashin ƙarfi a hannaye da ƙafafu, raƙuman fata, damuwa, matsalolin ƙwaƙwalwar ajiya, matsalar magana, matsalar ji, ko matsalar gani. Babban matakin bayyanar da methylmercury an san shi da cutar Minamata. Bayyanar Methylmercury a cikin yara na iya haifar da acrodynia (cutar ruwan hoda) wanda fata ta zama ruwan hoda da bawo. Rikice-rikice na dogon lokaci na iya haɗawa da matsalolin koda da raguwar hankali. Ba a san tasirin tasirin ƙarancin kashi na dogon lokaci ga methylmercury ba. Siffofin bayyanar mercury sun haɗa da ƙarfe, tururi, gishiri, da mahaɗan kwayoyin halitta. Mafi yawan bayyanarwa daga cin kifi ne, cikar haƙori na tushen amalgam, ko fallasa a wurin aiki. A cikin kifi, waɗanda ke sama a cikin sarkar abinci gabaɗaya suna da matakan mercury mafi girma. Kadan, guba na iya faruwa azaman hanyar yunƙurin kashe kansa. Ayyukan ɗan adam da ke sakin Mercury a cikin muhalli sun haɗa da kona kwal da hakar gwal.