Diagnosis is the process of identifying a disease or condition based on a person's symptoms and medical history. Doctors use various methods, such as physical examinations, lab tests, and imaging studies, to gather information. This helps them determine what might be causing a patient's health issues and how to treat them effectively. Once a diagnosis is made, it guides the treatment plan. For example, if a patient is diagnosed with diabetes, the doctor may recommend lifestyle changes, medication, or regular monitoring of blood sugar levels. Accurate diagnosis is crucial for ensuring that patients receive the right care and improve their health outcomes.