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Caught a cold can cause discomfort. The main causes include virus infection, low immunity, poor living habits, climate change, and contact with infected people. The following are some suggestions. 1. Virus infection: Many colds are caused by viruses such as rhinovirus and coronavirus. The body's immune system needs to fight against these viruses. 2. Low immunity: Weak immune function makes it easier to catch a cold. Maintaining a balanced diet, regular exercise, and adequate sleep can enhance immunity. 3. Poor living habits: Lack of sleep, excessive stress, and smoking can affect the body's resistance. 4. Climate change: Sudden temperature changes or dry and humid environments may trigger colds. 5. Contact with infected people: Close contact with those who have a cold increases the risk of infection. When catching a cold, pay attention to rest, drink plenty of water, and keep warm. If symptoms persist or worsen, it is recommended to seek medical advice in a regular hospital.