Medical signs are observable indicators of a patient's health status that can be detected by a healthcare professional during an examination. These signs can include physical findings such as swelling, redness, or abnormal heart sounds, which help in diagnosing medical conditions. Unlike symptoms, which are subjective experiences reported by the patient, medical signs are objective and can be measured or seen. For example, a doctor may notice a rash on a patient's skin or an irregular pulse during a check-up, providing crucial information for further evaluation and treatment.