Signs and symptoms Signs A medical sign is an objective observable indication of a disease, injury, or medical condition that may be detected during a physical examination. [8] These signs may be visible, such as a rash or bruise, or otherwise detectable such as by using a stethoscope or taking blood pressure. Easy and quick to use, simply enter all your symptoms to get a list of possible conditions along with medical guides for each explaining causes, symptoms, diagnosis and treatment options. There are some symptoms you can sleep off—and some you should never ignore. Here are 27 common health symptoms doctors say you should always take seriously. Lyme disease can cause fever, rash, and arthritis. Seek prompt medical care if symptoms appear. Stay informed about COVID-19 symptoms and prevention. Explore WebMD's comprehensive resource for information on signs, precautions, and the latest updates. Symptom Checker Check on one or more symptoms to find possible causes. About this Symptom Checker. Find possible causes of symptoms in children and adults. See our Symptom Checker. WebMD Symptom Checker is designed with a body map to help you understand what your medical symptoms could mean, and provide you with the trusted information you need to help make informed decisions in your life for better health. Signs and symptoms aren’t the same. Symptoms are what you feel, and signs are things your provider can see or test for. Learn the signs and symptoms that you should never ignore and if you experience any of these seek immediate medical attention or call 9-1-1.