Excessive secretion of catecholamines the hormones adrenaline (epinephrine) and noradrenaline (norepinephrine) can lead to persistent high blood pressure or wild fluctuations in your blood pressure, depending on whether the catecholamines are released continuously or in shorter bursts.

CNN: Pheochromocytoma

In a friend-of-the-court brief, Train and other past Republican and Democratic EPA administrators note that once the EPA ordered a phase-out of lead additives in gasoline, change resulted: Lead levels in peoples' blood and the attendant harms dropped precipitously.

NPR: Supreme Court Hears Global Warming Arguments