Here comes summer—and leg cramps!

Pregnancy-associated nighttime leg cramps occur twice as often in summer as in winter, a new study published in the Canadian Medical Association Journal suggests.

Researchers looked at quinine prescriptions written for more than 31,000 people in British Columbia, Canada, over six years. Quinine is commonly prescribed to treat leg cramps. The researchers also analyzed the frequency of online searches about leg cramps by people in Australia and the United States.

Prescriptions for quinine in British Columbia and online searches about leg cramps in the United States peaked in July. Online searches about leg cramps in Australia were highest in January, which is mid-summer in that country.

“Although there are anecdotal reports of pregnancy-associated rest cramps being worse in summer, these findings establish the phenomenon of seasonality in rest cramps in the general population,” wrote Scott Garrison, M.D., M.P.H., a member of the medical faculty at the University of Alberta and at the Center for Hip Health and Mobility at the University of British Columbia, and colleagues.

If you suffer from cramps, talk to your doctor about treatment.

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