The severity of multiple sclerosis (MS) may change with the seasons, say US researchers.
Brain scans of patients compared with weather patterns at the time showed higher levels of disease activity in the spring and summer.
The US researchers said the findings had implications for testing new medicines, which may show up different results depending on the time of year.
It is not clear why warmer weather would have this effect.
Other studies have shown that vitamin D from exposure to sunlight may have a protective effect against MS - a long-term inflammatory condition of the central nervous system.
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This really is intriguing, because you are more likely to be out in the sun (and create Vitamin D) in the Spring and Summer.
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