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Dementia with Lewy bodies (DLB) is associated with a range of cognitive and non‐cognitive symptoms. We aimed to identify if some of these symptoms might aid early diagnosis of Lewy body disease in cases of mild cognitive impairment (MCI).

Lewy body MCI (MCI‐LB; n = 36), Alzheimer's disease MCI (MCI‐AD; n = 21), DLB (n = 36), AD (n = 21) and control (n = 20) participants were recruited. An interview‐based questionnaire about the presence of symptoms thought to be associated with Lewy body disease was completed by participants with, where possible, their carer/relative. The prevalence of each symptom was compared between MCI‐LB and MCI‐AD and between established DLB and AD, and a symptom scale based on these findings was devised.

Fluctuating concentration/attention; episodes of confusion; muscle rigidity; changes in hand‐writing, gait and posture; falls …