1. Colds are mostly caused by viruses. Common viruses include coxsackievirus, respiratory syncytial virus, and adenovirus. After catching a cold, it is recommended to drink more water, rest more, urinate more, and keep warm.

2. It is best to check the blood routine to see if it is a viral infection or a bacterial infection. If it is a viral infection, oral antiviral drugs can be taken, which are divided into Chinese patent medicines and Western medicines.