But if you're still wondering why your hair doesn't thin out with all those strands coming out everyday, consider the numbers. The human head has 100,000 to 150,000 hairs on it, according to Beautylish, so 50-100 strands a day is a pretty small percentage of all the hair on your head. But while losing 50-100 strands a day is normal, some hair loss actually is cause for concern. Here are warning signs to look out for: 1. Your Hair Loss Is Increasing