Tic severity is known to fluctuate over time, including during the day, week, and across seasons. Many patients and clinicians observe reduced tics in summer and increased severity during winter, but research suggests the picture is more complex.
A Canadian study of 370 children found initial seasonal patterns in tic severity, with lower scores in summer and higher in winter. However, these effects disappeared when accounting for other factors, with mood—particularly depression—emerging as a stronger predictor than seasonality itself.
Overall, while seasonal changes are commonly reported, tic fluctuations are highly individual and influenced by multiple factors including stress, routine changes, and emotional wellbeing.
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