My husband gets a pretty severe headache when in the sun for only 4-5 minutes, sometimes even with a baseball cap on but definitely when he is hatless. Today he was outside for about 4 minutes for a fire drill at work and his headache formed in 4 minutes of sun exposure.

20 or more minutes causes nausea and an hour, even with a baseball cap, can cause vomiting. Our summers are pretty hot and sunny (yay for me, nay for him!). I am wondering why this extreme reaction to sun happens? He did not grow up in a place with hot summers but I didn't either and I don't have this problem.

TUESDAY, July 1 (HealthDay News) -- As the temperatures rise, older adults become more vulnerable to heat-related health issues because their bodies don't cool down as quickly as younger people.

"Sometimes, older people may not feel hot when the temperature is dangerously high and are also less likely to feel thirsty, which means their bodies have lost too much water," Dr. John B. Murphy, president of The American Geriatrics Society, said in a prepared statement.

I was out running this morning and noticed that my hands become extremely swollen. I notice the swelling is more prevelant in the heat. A few of my friends said they also experience the same thing. Anyone know the cause for this? Should I be concerned?