Coma is a cerebral state induced by a severe pathology of the brain which is no longer able to assume vital functions, particularly breathing. A coma prevents the patient from communicating with the people around him. The patient is unable to understand and perform simple orders. There are different kinds of coma depending on the etiology (cause and effects) and the localisation of the damage to the brain. We do not know what a patient can hear when in a coma, but it seems that the presence and voices of the patients’ loved ones can be recognised, even if the patient has little or no memory of this later on. Caregivers explain their actions to the patients and warn them before any physical contact. Hearing voices is beneficial to the patient.