CYCLIC ILLNESS 1 By N., Pam M.S. - April 7, 2013 1. any disorder marked by changing stages. 2. bipolar I disorder wherein both periods of mania and periods of depression take place at varying times, separate from each other. CYCLIC ILLNESS 1: "PMDD can be viewed as a cyclic illness." Related Psychology Terms BIPOLAR DISORDERS CYCLIC PARANOIA DIVALPROEX SODIUM CYCLOTHYMIC DISORDER AUTISTIC SPECTRUM DISORDER LAMOTRIGINE MOOD STABILIZERS ALZHEIMER'S DISEASE TIC DISORDER Cite this page: N., Pam M.S., "CYCLIC ILLNESS 1," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/cyclic-illness-1/ (accessed July 23, 2019).