While it's odd to think of yourself shedding hair in the summertime, it's a reality for many of us—especially those who live in a place that experiences big temperature swings this time of year.

What's going on? "When you have a major environmental change, so like right now when the temperature's going from the 10 to 30 in a day, that sudden change can shift more of your hair into what's called the telogen phase," says Dr Adam Friedman.

Friedman explains that this telogen hair phase is also known as the "death" phase, and it's completely normal. In fact, around 20% of your hair is in this death phase at any given time. That means it has stopped growing, and will soon fall out. "A healthy woman loses 150 to 175 hairs a day, while men lose a little less," Friedman says. Meanwhile, you're always making new hair. 

But when the seasons transition and the weather goes through violent temperature swings, those shifts can place mild stress on your body. "That stress can force some of your hair from the growth or anagen phase into that telogen phase," Friedman explains. 

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