-- Posted by Anonymous at 9:49 am on Dec. 1, 2008 im 17 years old female and my hair is emtremely thin..it didnt use to look like this but its been like a whie now and its not growing back what can i do and what causes this -- Posted by Natsy at 9:49 am on Dec. 1, 2008 bad genes -- Posted by hopeguz3 at 9:50 am on Dec. 1, 2008 genetic information -- Posted by childOfTheCorn at 9:50 am on Dec. 1, 2008 stop burning it with a hair straightener -- Posted by Hi Carie at 9:51 am on Dec. 1, 2008 There are a lot of things that can cause hair loss. Are you stressed? Do you eat a balanced diet? it is possible you have hormone problems, or a more serious medical condition. your best first bet is to consult a doctor. -- Posted by LittleBombs at 9:52 am on Dec. 1, 2008 Do you dye your hair? That could be the problem or tying your hair back too tightly, or it could be caused by stress/depression/weight loss etc. Same thing happened to me. I think my hair has gotten a bit thicker, but not a huge amount. I dye my hair blonde and brown now. The blonde helps expand your hair and make it look and feel fuller.