tension make you catch a cold

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Recently, I have millions of things to finish in a little time. So I have to work from days to nights. In the morning when I wake up, I feel I catch a cold and my nose and head is uncomfortable. Fortunately, I feel recover to well after making some walk at the noon. I think that maybe the reason I caught a cold is because I have get a nerves recently. I should take a relax after these work are finished.