Do you need a health certificate to travel to Thailand with a passport?

No need.

Thailand individual tourist visa is valid for 3 months and can stay for 60 days. The application materials include: passport (original) and two 2-inch photos with white background.

There are also many round-trip tourist visas, the cost is about 1200 yuan, and the holder can enter and leave Thailand several times within six months, and stay in Thailand for up to 60 days. Multiple visas require proof of permanent residence in China, proof of deposit of at least RMB 50,000 in the past six months, first round-trip air ticket to Thailand and first entry and residence address.

You can also apply for a visa on arrival.