Crimson Stem is a Nether-exclusive wood-like block that forms the trunks of crimson fungi, found in the Crimson Forest biome. Unlike Overworld logs, it has a deep red texture and is primarily used for crafting crimson planks, sticks, and other wooden structures. It can be stripped using an axe to create Stripped Crimson Stem, which has a smoother texture.

Crimson stems do not burn and can be used to craft fireproof wooden items, making them useful in Nether builds. When placed under a note block, they produce a bass sound.