While the color and thickness of hair on the stomach varies from person to person, everyone has some hair on their stomach. During a pregnancy, hair can also form on the stomach. This is natural hair growth triggered by hormone swings. After the baby is born, the hair usually falls out. For some women, though, the hair doesn't go away after the pregnancy; it's called mama's mark. Stomach hair is not only harmless, but it can also be used as an indicator of health issues. For example, women who have iron deficiencies will often have hair on their stomachs. Stomach cancer can also cause hair to grow on the abdomen. Some studies show that people with stomach cancer have higher rates of hair growth than those who don't have the disease. Doctors may also check your body for cancer-related markers when you visit them for other reasons, so keep that in mind if you're wondering why your doctor is checking for hair on your stomach. There are several factors that can cause women to have more hair on their stomachs. If you're pregnant, you probably know already that hormones can cause new hair to grow. After the baby is born, the hair usually goes away but for some women it doesn't. This is called "mama's mark". The hair is not harmful but it can be an indication of other health issues such as iron deficiency or cancer.