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MS Impact Could Change With Seasons
It is not clear though why warmer weather should have such an 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.
For the study, researchers compared MRI brain scans of 44 people taken from 1991 to 1993 to daily temperature, solar radiation and precipitation measurements over the same time.
The adults in the study, who had untreated MS, had eight weekly scans followed by eight scans every fortnight then six monthly check-ups - an average of 22 scans per person.
After one year, 310 new brain lesions were found in 31 people, they reported in Neurology.
The lesions were up to three times more likely to appear in the warmer spring and summer months.
Study leader Dr Dominik Meier, from Brigham and Women's Hospital in Boston, said: "Not only were more lesions found during the spring and summer seasons, our study also found that warmer temperatures and solar radiation were linked to disease activity."
He pointed out that clinical trials often use MRI (magnetic resonance imaging) to assess the effectiveness of a drug and studies commonly last between six and 12 months, which may have implications for how effective a new medication seems.
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