Most people lose anywhere from 50 to 100 strands of hair each day, according to the American Academy of Dermatology. On the days when hair is washed, people can lose up to 250 strands. But don’t avoid washing in an attempt to keep the hair, as it will fall out eventually, anyway. Hair loss can appear in many different ways, depending on the problem that’s causing it. It can come on suddenly or gradually and affect just your scalp or your whole body. Some types of hair loss are temporary, while others are permanent. Here’s what you need to know about hair loss.