Your pulse measures the wave of pressure that travels through your arteries each time your heart beats. Every time the heart contracts, it pushes blood into the aorta and onward through the arterial system, causing the artery walls to briefly expand. That expansion is what you feel when you press your fingers against your wrist or neck. The most basic information it gives you is your heart rate, measured in beats per minute (bpm), but your pulse also reveals details about your heart’s rhythm, the strength of each beat, and the overall state of your cardiovascular system.
How Your Heartbeat Becomes a Pulse
During each heartbeat, your left ventricle contracts and forces blood past a one-way valve into the aorta, your body’s largest artery. This rapid ejection of blood raises the pressure inside the aorta to its peak of about 120 mmHg, which is the top number in a blood pressure reading. That pressure spike doesn’t stay in one place. It radiates outward as a wave, traveling along the elastic walls of your arteries all the way to your fingertips and toes.
When you feel your pulse at the wrist, you’re detecting that pressure wave arriving at the radial artery. The wave moves much faster than the blood itself, which is why you feel it almost instantly after each heartbeat, even in arteries far from the heart. Between beats, the pressure drops as the heart refills, and the artery wall relaxes. That rhythmic expand-and-relax cycle is your pulse.
Heart Rate: The Number Most People Want
Counting the number of pulses you feel in 60 seconds gives you your heart rate. For most adults, a normal resting heart rate falls between 60 and 100 bpm. Well-trained athletes often have resting rates in the 40s or 50s because their hearts pump more blood per beat and don’t need to contract as frequently.
Children run higher. Newborns can have resting rates between 100 and 205 bpm. Toddlers typically range from 98 to 140, and school-age kids from 75 to 118. By adolescence, the range settles into the adult zone of 60 to 100. These ranges apply when you’re awake and at rest. Sleep lowers your rate, and physical activity raises it.
A resting rate consistently above 100 bpm is called tachycardia. A rate below 60 is called bradycardia. Neither is automatically dangerous. A slow rate in a fit person is a sign of an efficient heart. But if a slow rate comes with dizziness, fainting, confusion, chest pain, or shortness of breath, that’s a different situation. A rate dropping into the 30s can starve the brain of oxygen, causing lightheadedness and loss of consciousness.
Rhythm: Steady, Skipping, or Chaotic
Beyond speed, your pulse reveals whether your heart is beating in a regular pattern. A healthy heart keeps a steady rhythm, with roughly equal time between each beat. When you check your own pulse, pay attention to the spacing. An occasional skipped or extra beat, called a premature beat, is common and usually harmless. These feel like a brief pause followed by a stronger-than-usual thump.
A persistently irregular rhythm is more significant. Atrial fibrillation, the most common sustained arrhythmia, produces a chaotic, unpredictable pulse. The beats come at random intervals, and their strength varies from one beat to the next. Atrial flutter is similar but slightly more organized. Ventricular tachycardia, which originates in the lower chambers of the heart, produces a rapid and irregular pulse that can become an emergency. If your pulse feels consistently erratic rather than occasionally off, that’s worth investigating.
Pulse Strength and What It Tells You
The force behind each pulse beat carries information too. Clinicians grade pulse strength on a simple four-point scale: absent (no detectable pulse), weak and thready, normal and strong, or full and bounding. You don’t need to assign a number at home, but you can notice the difference between a firm, easy-to-find pulse and one that’s faint and hard to detect.
A weak pulse can reflect low blood pressure, dehydration, or reduced blood flow to that limb. A bounding pulse, one that feels unusually forceful, can show up during exercise, fever, anemia, or after drinking alcohol. Comparing the strength of your pulse on both wrists can also be informative. A noticeably weaker pulse on one side may suggest a blockage or narrowing in the artery supplying that arm.
Pulse vs. Heart Rate: Not Always the Same
Most of the time, the pulse you feel at your wrist matches the rate your heart is actually beating. But in certain conditions, some heartbeats are too weak to push enough blood all the way to your wrist, so you miss them. The difference between the true heart rate (measured by listening directly to the chest) and the pulse you feel at a distant artery is called a pulse deficit.
This gap shows up most often in atrial fibrillation, where some contractions happen before the heart has had time to fill with enough blood to generate a detectable pulse wave. It can also occur with premature ventricular contractions, severe low blood pressure, and significant fluid loss. A pulse deficit means the number you count at your wrist may underestimate how fast your heart is actually beating.
What Affects Your Resting Pulse
Your resting pulse isn’t a fixed number. It shifts throughout the day and responds to dozens of influences. Physical activity, stress, anxiety, pain, and fever all raise it. Sleep and deep relaxation lower it. Caffeine acts as a stimulant and can push your rate up or trigger irregular rhythms in some people. Nicotine does the same.
Several categories of medication have a direct effect on pulse. Beta-blockers, commonly prescribed for high blood pressure and heart conditions, slow the heart rate, sometimes significantly. Even beta-blocker eye drops used for glaucoma can lower your pulse. On the other end, stimulant medications for ADHD, decongestants containing pseudoephedrine, and certain asthma inhalers can speed it up. Recreational drugs like cocaine and amphetamines push heart rate up sharply and can trigger dangerous arrhythmias.
Dehydration is an underappreciated factor. When blood volume drops, the heart compensates by beating faster to maintain circulation. If your resting pulse seems unusually high on a hot day or after a bout of illness, inadequate fluid intake could be the reason. Thyroid function matters too: an overactive thyroid accelerates the heart, while an underactive thyroid can slow it.
How to Check Your Own Pulse
The easiest spot is the inside of your wrist, on the thumb side. Place your index and middle fingers (not your thumb, which has its own pulse) gently over the area and press lightly until you feel the beats. Count for 30 seconds and multiply by two, or count for a full 60 seconds if the rhythm seems uneven.
You can also check at the side of your neck, just below the jawline, where the carotid artery runs close to the surface. This spot often gives a stronger signal, which makes it useful during exercise when peripheral pulses can be harder to find. Whichever spot you use, try to check at the same time of day and in the same position (sitting, resting for a few minutes) if you want to track trends over time. A single reading matters less than the pattern across days and weeks.