What causes sudden heart flutter and palpitations?

[BrianJ]

I’ve been getting these strange, sudden waves of feeling like my heart is fluttering or doing a hard thump in my chest, and it’s starting to worry me. It only lasts a second or two, but it’s unsettling, and I’m not sure if it’s just stress or something I should actually get checked out.

[Natalie.L]

I know that fluttering feeling. I had something like that after a rough week. It would pop up for a second or two and then vanish. I told myself it was stress or caffeine, but I booked a quick check anyway. An ECG and basic tests came back normal, which was a relief, but the worry didn’t vanish entirely.

[AddisonJC]

Could be anxiety, dehydration, too much coffee, or just a quirky heartbeat. It’s easy to chalk it up to stress, but if it’s new or keeps happening, it’s worth mentioning to a clinician.

[Jerry38]

I tried tracking it for a bit—time of day, what I drank, sleep, stress level. It didn’t give me a clean pattern, but it gave me something concrete to say to the doctor and it stopped me guessing in the moment.

[Kenneth29]

Have you noticed any chest pain, dizziness, or trouble catching your breath with these episodes?