Medical case narrative
A 19-year-old told it was anxiety — her heart rate told the truth lying down and standing up
What happened
A 19-year-old woman with disabling symptoms that had been read as anxiety underwent tilt-table testing.
What it looked like
A racing heart, light-headedness, and overwhelm on standing — easily mistaken for panic, especially in a young woman.
What the labs found
On tilt testing, her heart rate rose from 61 to 124 beats per minute — meeting criteria for POTS (postural orthostatic tachycardia syndrome), a disorder of the autonomic nervous system. (The 124 reading is the 10-minute value; a 122 reading came earlier in the test.)
What changed
A physiological diagnosis with a name, a mechanism, and a management path — replacing "it's anxiety" with a measurable finding anyone can reproduce with a heart-rate monitor and ten minutes standing.
The test that told the story
Tilt-table / active stand test (heart rate lying vs. standing).
Sources: Published case report.