A physician is a doctor that is used on regular basis, or for a specific occasion. Many people hate going to see physicians, and hold off until a serious problem persists. People have many different physicians. Until the age of eighteen people have primary pediatricians. These types of physicians work with children and perform annual check ups and procedures on them. They specialize on procedures that are specific to children and their immune systems. Parents are required to bring children to see these physicians because they are under age. It is extremely important that children see the same physician when they are younger so that they can be closely monitored properly and records are not lost. This also creates a significant bond between the child and the physician, seeing as how children hate the doctor. After the age of eighteen a teenager is required to find a primary care physician. These physicians are used to ensure the young person stays healthy. Most people experiment at first with new doctors to see who best fits them. Once the physician is chosen, most people stick with them for life. This creates a comfortable environment for both the patient and the doctor, and ensures that they are the healthiest possible. A primary care physicians purpose is to know a patients body inside and out, and create a trust between themselves and their patient. Many times people will go to this doctor for every diagnosis and every check up unless there is an emergency, or a referral has been made by the physician.