Seeing hair on your comb is normal: we all lose hair. But if a person starts losing too much hair or if it lasts for a long time, it is a cause for concern. Hair loss is considered normal, it does not affect the appearance or temperature of your scalp much, because your scalp produces more hair to compensate for the amount of hair lost every day. But when you start seeing bald spots or bald patches on your scalp, this means that there is a cause for your hair loss.