幻觉 (huàn jué): ภาพลวงตา

When he had a fever, he experienced hallucinations and saw things that didn't exist.

Travelers in the desert often hallucinate due to lack of water.

This medication may cause hallucinations, so it must be used with caution.

He thought he saw a ghost, but actually it was just his hallucination.

Long-term insomnia can lead to mental fatigue and even hallucinations.