Signs and symptoms are indicators of a medical condition. Signs are observable by others, such as a rash or fever, while symptoms are experienced by the individual, like pain or fatigue. Both help healthcare professionals diagnose and treat illnesses. Common signs include changes in skin color, swelling, or abnormal heart rate. Symptoms can vary widely, including headaches, nausea, or shortness of breath. Recognizing these signs and symptoms is crucial for timely medical intervention and effective treatment of conditions like diabetes or asthma.