My daughter having heavy hair fall only left side of head, why it is happening

A. In for 6 to 8 months hair fall is considered very normal and common but if your child is having much of a hair fall and you consider it to be very heavy then it is going to be advisable for you to one time get it checked with a dermatologist because without a proper check up at would be difficult to say why this is happening in what is needed to be done