nagging, underlying, plagued, repeated, generating, nonrecurring, deferred, sustaining, ending, enduring, continuing, niggling, palliated, rerun, lingering, revolving, reprising, flaring, compounding, persisting, erythema nodosum, related, deriving, snowballing, resulting, stemming, entraps, cash flow, churn, overcoming, depersonalization disorder, experiencing, vocal cord, localized, disjoined, recovers, growing, externalize, arise, underrun, associated, reappearing, dogging, overlapping, frontal sinus, phantom limb syndrome, cumulating, calcifying, molluscum contagiosum, costochondritis, sidelined, amortizing, recapitulates, psychogenic fugue, disconnects, nasal septum, incurring, inguinal hernia, interrupting, varicose vein, festering, centering, molar pregnancy, recites, fixed, nebbishy, alleviates, revolve around, accrete, suppurating, salving, materializing, bedeviled, gastroesophageal reflux, amebic dysentery, afflicting, dissociative disorder, twofold, hiatus hernia, cardiac tamponade, equilibrating, granulation tissue, irritating, deviated septum, overriding, fluctuating, hemophilia b, annoying, beset, spoofed, befalling, blackwater fever, situation comedy, adrenal insufficiency, rh incompatibility, provisioning, lymphatic vessel, channeling, debilitating, suffering, recast, urinary retention, troubling, dominating, perplexing, confusing, mystifying, pressing, vexing, worrisome, baffling, disturbing, puzzling, pivotal, problematic, qualifying, trying, worrying, compelling, embarrassing

., act up, aperiodic, business cycle, cluster headache, constant, cycle, cyclic, cyclical, cyclicity, day, haunting, hemicrania, histamine headache, law, law of nature, megrim, menstrual cycle, migraine, motif, nonperiodic, nonrapid eye movement, nonrapid eye movement sleep, nrem, nrem sleep, orthodox sleep, paradoxical sleep, perennial, periodic, periodical, periodicity, persistent, phase, phase of the moon, pulsation, rapid eye movement, rapid eye movement sleep, rare, recur, recurrent, recurrent fever, regular recurrence, relapsing fever, rem, rem sleep, repeated, rhythm, rhythmic, rhythmical, round, sick headache, sporadic, trade cycle