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In page Meditation:

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The Visuddhimagga mentions various unpleasant stages, and possible "unwholesome or frightening visions" are mentioned in Practical Insight Meditation: Basic and Progressive Stages, a practical manual on vipassanā meditation by Mahāsi Sayādaw.[13] Classical sources mention makyō, Zen sickness (Chinese and Japanese: 禪病; pinyin: Chánbìng; rōmaji: Zenbyō)[3] and related difficulties, such as zouhuorumo (走火入魔; 'fire possession'), and mojing (魔境; 'demonic states').[14] Traditional sources also precribe cures against these experiences,[15] for example Hakuin Ekaku's treatment of Zen-sickness.[citation needed]