Vital signs

Doctors check your body to see if you are well.

They check how warm you are with a tool.

They also feel your heart beat. This is called your pulse. It shows how fast your heart pumps. They check how you breathe, too.

They also check your blood pressure. These signs change as you grow up. Babies have faster heart rates than adults. Checking these signs helps doctors help you.

Doctors check your body to see how you are doing. They look at your vital signs. These are important signs that show how your body works. There are four main vital signs.

First is body temperature. This shows how warm you are.

A thermometer measures this. A fever is when your temperature is 38 °C or higher.

Second is your pulse. This is your heart rate. It is how many times your heart beats in one minute.

You can feel your pulse at your wrist. A newborn baby has a fast heart rate. An adult has a slower heart rate.

Third is your breathing rate. This is how many breaths you take each minute.

Fourth is blood pressure. This is the force of your blood.

A tool called a sphygmomanometer measures it. It shows two numbers. One number is for when your heart beats. The other is for when your heart rests. Doctors use these signs to see if you are getting better. They can also find signs of illness early.

Vital signs are special measurements that doctors use to check your health. These signs tell us how well your body is doing its most important jobs. There are four main vital signs that experts look at every day. These are your body temperature, your pulse, your breathing rate, and your blood pressure.

Doctors also sometimes look at a fifth or sixth sign. They use these numbers to see if a person is getting better. These signs can also help doctors find problems before they become very serious.

Each vital sign works in its own way to show health. Body temperature shows how your body manages heat. A thermometer can measure this in your mouth, ear, or armpit.

Your pulse is your heart rate, or how many times your heart beats every minute. You can feel this at your wrist or your neck. Breathing rate shows how many breaths you take in one minute. Finally, blood pressure measures the force of blood moving through your body.

This is measured with a tool called a sphygmomanometer.

Medical tools have changed a lot over many years of use. In the past, doctors used a mercury sphygmomanometer to check blood pressure. This tool used a column of liquid mercury to show the pressure. Today, most people use electronic or aneroid versions of these tools. Doctors can also use a stethoscope to listen to your heart or lungs. This helps them hear your pulse or your breathing more clearly. These tools help make sure the measurements are very accurate.

Vital signs change depending on how old a person is. A newborn baby has a very fast heart rate between 100 and 160 beats per minute. As people grow up, their heart rates get slower. An adult usually has a heart rate between 60 and 100 beats per minute. Breathing rates also change with age. For people between 18 and 65, a normal rate is 16 to 20 breaths per minute. Blood pressure in adults is often around 120 over 80. These numbers give doctors a guide for what is normal.

Understanding vital signs is like reading a map of your body. Just as a map shows you where you are, these signs show your health status. If your temperature is 38 °C or higher, it might mean you have a fever. If your blood pressure is very high, it is called hypertension. If it is very low, it is called hypotension. Doctors use these clues to help people stay healthy. They can even use special scores to watch for any sudden changes.

Vital signs, often called vitals, are a group of the most important medical measurements. These four to six indicators reveal the status of the body's life-sustaining functions. Medical professionals use these measurements to assess general physical health. They also provide clues regarding possible diseases and track progress toward recovery. Because these signs reflect how the body is functioning, they are essential for clinical assessment.

Body temperature is one of the primary vital signs. The body uses a process called thermoregulation to maintain a stable internal temperature. This is necessary because temperature affects the rate of chemical reactions within the body. Temperature is measured using a thermometer in the mouth, rectum, axilla, ear, or on the skin. For example, rectal temperatures are typically 0.5 °C higher than oral readings. Conversely, axillary temperatures are about 0.5 °C lower than oral readings. A temperature of 38 °C or higher is considered a fever, which may signal infection or inflammation. If the temperature drops below 35 °C, the condition is called hypothermia. Other causes of high temperature include hyperthermia, which involves unregulated heat generation.

Pulse, or heart rate, measures how many times the heart beats per minute (bpm). This measurement tells clinicians how effectively the heart is pumping blood through the arteries. To find a pulse, a person applies firm but gentle pressure with their index and middle fingers. Common sites include the radial artery at the wrist or the carotid artery in the neck. Other locations include the brachial artery in the elbow, the poplitean artery behind the knee, or the dorsalis pedis in the foot.

Clinicians may also use a stethoscope to listen to the apical pulse, which is the heartbeat heard directly from the heart. The pulse rate can change based on exercise, fitness, emotions, or medications.

Respiratory rate measures how many breaths a person takes every minute. For adults aged 18 to 65, the normal range is typically 16 to 20 breaths per minute. This measurement is a clear indicator of acidotic states. This happens because the main function of respiration is to remove carbon dioxide (CO2) from the body. By removing CO2, the body maintains a bicarbonate base in the blood circulation. While respiratory rate can indicate respiratory dysfunction, some studies suggest its value as a standalone indicator is limited.

Blood pressure is the force of blood moving through the body's vessels. It is recorded using two different numbers: systolic and diastolic pressure. Systolic pressure is the higher reading, occurring during the maximal contraction of the heart. Diastolic pressure is the lower reading, occurring while the heart is at rest. In adults, a normal reading is often 120/80 mmHg. The difference between these two numbers is known as the pulse pressure.

High blood pressure is called hypertension, often defined when systolic pressure is persistently over 140–160 mmHg. Low blood pressure is known as hypotension. Doctors may also measure segmental blood pressures in different parts of the limbs to check for arterial occlusion.

Vital signs change significantly based on a person's age. For instance, a newborn has a heart rate between 100 and 160 bpm. As a person grows, this rate generally decreases. An infant aged 0 to 5 months typically has a heart rate of 90 to 150 bpm. A toddler aged 1 to 3 years has a rate between 80 and 130 bpm. By the time a person reaches adolescence (ages 11 to 14), the rate is 60 to 105 bpm. Adults aged 15 and older typically fall within the 60 to 100 bpm range. Respiratory rates also shift, with newborns having much higher rates than adults.

In different medical settings, clinicians may include additional measurements. In the United States, providers often record height, weight, and body mass index (BMI). While these do not show acute changes, they help assess chronic health problems. Some organizations consider pain to be the "fifth vital sign," measured on a scale from 0 to 10. Other potential fifth vital signs include oxygen saturation, blood glucose levels, or the menstrual cycle. In emergency settings, EMTs might use a different set of five vitals, including skin and pupil response. Monitoring these parameters is vital because deteriorating vitals often precede cardiac arrest or intensive care admission.

Modern technology has changed how these signs are monitored. While doctors once relied on mercury sphygmomanometers, many now use electronic or aneroid versions. In intensive care units, multimodal monitors display several parameters at once. This allows staff to see continuous changes in a patient's condition. Some companies are even developing devices for consumers to monitor their own vitals at home. These advancements allow for better tracking of health trends over time.