The first layer means that you can always pay attention to your physical condition, whether you are uncomfortable recently, or whether the original discomfort has changed, whether it is light or heavy. If the discomfort is unacceptable to your body or mind, you need to see a suitable doctor. This is what doctors tell patients to pay attention to discomfort and follow up in hospital outpatient or inpatient departments, which means that patients take the initiative to seek medical assistance.
The second and another name is follow-up, which is retrospective diagnosis and treatment service, guidance and patient's condition tracking. In the hospital, doctors contact doctors for patients by asking them to go to the hospital for re-examination regularly or irregularly according to their recent illness and actual situation, or by knowing the patient's situation at home or by email.