Heart rate 126 on an adult - what does it mean?

Where 126 bpm sits on the adult scale

What a resting pulse of 126 means

If you just climbed stairs, exercised or are very anxious, a pulse of 126 can be a normal response and should fall within minutes. A fast rate that persists at rest can come from fever, dehydration, blood loss or anemia, an overactive thyroid, or a heart rhythm disorder such as atrial fibrillation, atrial flutter or supraventricular tachycardia (SVT).

An irregular pulse at this speed is a typical sign of atrial fibrillation, which raises stroke risk and should always be evaluated.

Ranges apply to adults and children aged 10 and older, measured at rest (American Heart Association). By the numbers: at 126 bpm the heart beats about every 0.48 seconds — roughly 181,440 beats a day.

Feverish with a pulse of 126: does the fever explain it?

A raised temperature speeds the heart. A useful rule of thumb is about 10 extra beats for every degree Celsius of fever, which is close to 5 to 6 beats per degree Fahrenheit. That gives a rough way to judge whether a 126 fits the illness or points to something more.

Try the sum with your own numbers. Suppose your usual resting rate is 70 and your thermometer reads 102.2 °F, which is 39 °C, about two degrees above normal. Fever alone would account for something like 90. A pulse of 126 is well beyond that. The gap suggests extra load from dehydration, pain, a more serious infection or another cause, and that is the situation where a call to a doctor today makes sense rather than waiting it out.

The rule is rough, but a pulse running far ahead of the temperature is one of the patterns clinicians notice.

Who should call sooner

Contact a doctor or urgent care the same day if a fever comes with a resting rate in the 120s and any of these apply:

• you are over 65, pregnant, or have heart, lung or kidney disease;
• you take medicines that weaken the immune system, such as chemotherapy or steroids, or have no spleen;
• you have had surgery, a procedure or a hospital stay in the past few weeks;
• you cannot keep fluids down or are passing very little urine;
• the fever has lasted more than three days or came back after improving.

What to do in the meantime, and when it is an emergency

Drink small amounts often. A fever-reducing medicine you know you tolerate, taken as the label directs, usually lowers both temperature and pulse within an hour or so. Recheck both together after that. A rate that falls with the fever is reassuring. One that stays in the 120s even after the temperature comes down deserves a doctor’s assessment, because the fever no longer explains it.

Call 911 if fever and a fast pulse come with confusion or unusual sleepiness, breathing that is fast or hard work, a rash that does not fade when pressed with a glass, a stiff neck, mottled or bluish skin, chest pain, or fainting. These can be signs of a serious infection that needs treatment within hours. Normal adult heart rate shows where your usual value should sit once you have recovered.

For a reliable resting value, sit quietly for five minutes first and average a few mornings: Resting Heart Rate: What It Says About Your Health. You can also measure by tapping along on the start page.

Nearby values

• 121 bpm
• 122 bpm
• 123 bpm
• 124 bpm
• 125 bpm
• 127 bpm
• 128 bpm
• 129 bpm
• 130 bpm
• 131 bpm

Measured on a child instead? See heart rate 126 in a child.

Sources: American Heart Association: All About Heart Rate · MedlinePlus: Pulse · ACSM position stand on exercise intensity (2011)

This page explains a single reading in general terms. It is not a diagnosis. Heart rate alone cannot tell whether the rhythm is regular or whether the heart is healthy — if you are worried, talk to a doctor.