Elizabeth Olsen remembers their first panic attacks.

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Elizabeth Olsen thought she would "drop dead" after suffering her first panic attack.

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The actress, who was 33, was just 21 and resided in New York City when she began experiencing attacks "on the hour every hour" for six months.

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She said in Variety: "I didn't understand the meaning of anxiety or panic attacks until I turned 21.

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She said in Variety: "I didn't understand the meaning of anxiety or panic attacks until I turned 21.

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"If I changed from hot to cold and cold to hot and full to hungry, full and full -- or any change that I felt in my entire body was thinking, 'Uh oh, it's a problem there!'

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She also said: "I had a friend who saw a neuropsychiatrist or psychologist. I'm not sure whether they prescribed medication since she was suffering from panic attacks before me.

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She said: "That was a helpful tool. It was an exercise that got me off the path.

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"I wanted to avoid taking medication, but I did have medication in case I was in the middle of an emergency. Having it in my bag was good.

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