No one wants thinning hair, but for most people, it is an inevitable part of life. Whether you develop outright baldness or your hair just loses fullness as you age, thinning hair can be a source of considerable stress. There are a number of treatments to stop or reverse the thinning of hair, but most of them work best if you start using them before significant hair loss occurs. Learn to spot thinning hair so you can treat it before it goes too far.

Trust your instincts. It may seem obvious, but if you think your hair is thinning, it probably is. If you have any close-up, high-quality pictures of your head from a few years ago, look at them and compare what you see in the picture with what you see in the mirror.

Look at your part. If your hair is thinning, your part will appear wider and more defined.

Watch for a receding hairline. In men, receding hair around the forehead and temples often accompanies a general thinning of the hair. Women with thinning hair may see thinner, downy hair with less definition around the hairline.

Look for thinning on top of your head. The top of the head is the most common spot for women to experience thinning hair, and it is one of the two most common spots for men. If you see a big difference between the density of hair on top of your head and in other places, you are probably losing hair.

Notice any increase in the number of hairs you lose on a daily basis. If you are finding more hairs in your brush or if the tub is frequently clogged with hair, it may be a sign that your hair is thinning.