I'm 15 and I have a few strands of white hair Is that normal Is there any specific cause like stress or does this just happen sometimes?

It's not uncommon for some teenagers to have a few strands of white or gray hair, as genetics can play a significant role in when and how hair loses its pigment. While stress can contribute to premature graying, other factors such as nutritional deficiencies, hormonal changes, and underlying medical conditions can also be involved. If you're concerned, it's a good idea to talk to a healthcare professional for personalized advice.