Clinical communication underpins safe patient care.  The effective health professional sees illness through the patients eyes and understands what matters most to him or her.  Effectiveness means gathering hard clinical data about the physical changes affecting the patient, understanding why the patient is concerned, conveying this to other health care professionals and involving the patient at every stage of management decisions.The evidence for good clinical communication is well established, although there are challenges.  While listening is the basis of sound diagnosis and clinical reasoning, its absence affects patient outcomes particularly when patients are not permitted to make their concerns known or when there are gaps in information flow or communication between the professionals caring for them.The ABC of Clinical Communication considers the evidence pertinent to individual encounters between patients and their health professionals, how to achieve efficient flow of information, the function of clinical teams and developing a teaching programme.  Topics covered include:The consultationClinical communication and personality typeShared decision makingCommunication in clinical teamsCommunication in medical recordsCommunication in specific situations, including mental health and end of lifeTeaching clinical communicationThe chapter authors are clinicians involved in communicating with patients, research and training healthcare professionals of the future.  This team reflects the multidisciplinary approach required to develop effective clinical communication.