Why am I losing so much hair?

I am 20 years old, and have in the last few months been losing much more hair than usual. The hair isn't coming out in 'chunks', it's more just a large amount of loose hairs. There is no history of female baldness in my family.



I straighten my hair most days and use a thermal protector spray before and a moisturising cream after. I have been doing this for years though, and have never had any hair loss.



Any idea what could be causing this?Why am I losing so much hair?
If you are taking birth control pills then it's probably because of them.Why am I losing so much hair?
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http://www.beautifulhamesha.com/Hair-Fal