On cold days, watch for...iStock/Borut Trdina
Heart attack One 2012 U.S. study found an 18 percent increase in heart attack deaths in winter and a 10 to 12 percent decrease in summer. Cold weather may constrict blood vessels or lead to more blood clots. Psoriasis flares Cold, dry air sucks moisture out of the skin, which makes it more vulnerable to the disease’s trademark red, scaly patches. A good, greasy, penetrating moisturizer can help.
On rainy days, watch for...iStock/Pamela Moore
Arthritis As atmospheric pressure drops, tissues near joints expand and put pressure on nerves. (However, some studies that tracked symptoms with weather didn’t find a strong link.)
When lightning strikes, watch for...iStock/cincila
Migraines A study found that these headaches were 28 percent more likely to occur when lightning struck, perhaps due to electromagnetic changes.
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On hot days, watch for...iStock/RapidEye
Gout Dehydration from sweltering temps can cause uric acid, a trigger of gout pain, to accumulate. Multiple sclerosis Steamy weather and even slight rises in core body temperature—caused by a fever or taking a hot bath—can exacerbate symptoms.