In brief: May have blocked ear. You can hear your breathing because the sound is transmitted through bone. You may have a conductive hearing loss such as wax build up or fluid in middle ear. This should be evaluated by a health professional. You can hear your breathing because the sound is transmitted through bone. You may have a conductive hearing loss such as wax build up or fluid in middle ear. This should be evaluated by a health professional. In brief: May have blocked ear. You can hear your breathing because the sound is transmitted through bone.