Signs or Symptoms

What Is the Difference?

man with thermometer
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What Is the Difference Between Signs and Symptoms?

Go to any medical site on the internet to research any medical condition and you're likely to read a list of signs and symptoms for it. Most people understand the idea of indications and feelings that help identify medical problems, but do you know what the difference is between signs and symptoms?


Signs are, well, signs (I'll explain shortly) and symptoms are feelings.

Symptoms can only be described by the person feeling them. If you are having pain, no one knows unless you tell them. It's the same with dizziness, numbness, lightheadedness, fatigue, vision disturbances, ringing in your ears and a whole host of other feelings that anyone not in your body is only going to know if you describe it.

That doesn't mean other people don't notice when you are not feeling well. If your face is pale, or you are unstable when you walk, or you are sweating, then you are showing signs. Signs have to be seen and read by the healthcare provider, rather than felt. Signs are just what they sound like: indicators of a problem.

The most important signs of all are called the vital signs. The vital signs include breathing rate, heart rate (pulse), temperature, and blood pressure. Vital signs can include other measurements, such as pulse oximetry.

People read signs all the time.

Need to go to the 4th floor? Push the elevator button next to the sign with the "4" on it. Need to take the freeway north? Read the signs to find the right ramp.

Medical signs aren't always read with the eyes. Sometimes we read signs by touch or by listening. Some of the most common signs we assess in the medical field are the skin signs: color, temperature and moisture.

People who are pale, cool and moist are usually feeling pretty bad.

Parents read signs from the day they bring their first child home. The baby's crying, maybe he needs to be fed.

Sometimes, signs indicate symptoms (like how a crying baby may be a hungry baby). Is your daughter scratching her arm (sign)? She must feel itchy (symptom). People vomit (sign) when they are feeling nauseate

Most medical conditions have both signs and symptoms that help identify what is wrong. Heart attack patients will often complain of symptoms—pain or pressure in the chest and arm—and show signs, clutching the arm or chest, pale face, sweating, abnormal heart rate and high blood pressure, for example.

Often at First Aid, just to keep things uncomplicated, I'll use the term symptom for everything. The most important thing to remember is to pay attention to both symptoms and signs when you're concerned about a possible emergency.

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