There are many reasons why people often catch colds in winter, such as poor resistance, climatic factors, disease transmission, and so on. 1. Poor resistance: for infants and young children, the elderly, and the physically weak, their own resistance and immunity is relatively low, so it is easy to catch a cold in winter. 2. Climatic factors: Winter temperature is relatively low, so it is also one of the causes of respiratory diseases. Cold air can easily induce respiratory diseases, and if you don’t pay attention to warmth, you will easily catch a cold, which will cause a cold. 3. Disease transmission: Colds themselves are contagious and can spread through air droplets. If someone around you is diagnosed with a cold and does not take proper protective measures, the cold will spread through the air and droplets. There are many reasons why people often catch colds in winter, and it is important to strengthen protective measures and keep warm, and if you have any discomfort, you should consult a doctor in a timely manner, make a clear diagnosis, and follow the doctor’s instructions to take targeted treatment.