Why do I get sick around Tomb-Sweeping Day every year?

Qingming is a solar term in spring, fifteen days after the vernal equinox. The solar terms in China are actually saying that climate change is an important symbol of farming. As soon as Qingming arrives, the weather gets warmer, so the farmer said, "Before and after Qingming, plant melons and beans"; Before Tomb-Sweeping Day, because the weather was still getting warmer and colder, we often didn't know whether to wear thicker or thinner. In Tomb-Sweeping Day, the weather is warm, and everyone is basically reducing their clothes. At this time, in fact, the body has not been fully prepared, it is easy to get sick, and the probability of catching a cold is relatively high. So it's best not to cut clothes too soon, even if it gets warmer after Tomb-Sweeping Day.