When you do something daily, one day leads to the next and one thing leads to another.

你每天做一点事，一天接着另一天，一件事通向另一件。

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"It could be just day-to-day, normal things, but when they pile up, one stressful thing leads to another and before you know it, you've got a full-blown tension headache, " Jaesson said.

CNN: How to release the vise-grip of tension headaches