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One of the main reasons we see thin hair in women is due to their genetic makeup. The truth is that if your parents and other family members suffer from thinning hair or hair loss (also termed alopecia), you have an increased risk for it as well. 

So, why does genetics cause very thin hair? Researchers are still trying to determine exactly how this works, but studies have shown that numerous genetic factors influence your hair in many ways—from its color to its texture and thickness. Oftentimes, when your genetic makeup is the cause of hair loss or thinning, it appears in a predictable pattern, which is known as male or female pattern baldness. In women, this most often begins with a widening part, which is a common place to first notice hair loss. In fact you’ve ever thought to yourself, “My hair is so thin I can see my scalp,” odds are that you first saw it along your part.