Yes, tea naturally contains caffeine. Caffeine is a natural stimulant found in the leaves of the tea plant, Camellia sinensis. The amount of caffeine in tea can vary depending on several factors, including the type of tea, processing method, and how the tea is made.

Here is a general guide to the caffeine content in different types of tea:

1. Green Tea: Contains a moderate amount of caffeine, typically ranging from 20 to 45 milligrams per 8-ounce cup, depending on the specific type and brewing method.
2. Black Tea: Generally has a higher caffeine content compared to green tea, ranging from 40 to 70 milligrams per 8-ounce cup.
3. White Tea: Contains a moderate amount of caffeine, similar to green tea, with approximately 15 to 30 milligrams per 8-ounce cup.
4. Oolong Tea: Falls between green and black tea in terms of caffeine content, with approximately 30 to 50 milligrams per 8-ounce cup.
5. Herbal Tea: Herbal infusions or tisanes (e.g., chamomile, peppermint, rooibos) are not true teas as they come from different plants. They are typically caffeine-free or very low in caffeine, making them suitable for those looking to avoid or limit caffeine intake.

It is important to note that the actual caffeine content may vary depending on factors such as tea variety, growing conditions, and brewing time. Additionally, decaffeinated teas are also available, from which most of the caffeine has been removed through a process, but a small amount may still remain. If you are sensitive to caffeine or want to limit your intake, you can choose low-caffeine or caffeine-free tea options.