One speaks of real hair loss only when a person loses more than 100 hairs in one day and this has visible consequences. A normal person loses 100 hairs in a day, but they grow again. Visible result may be a receding hairline and / or thinning of the head of hair.
Alopecia areata or plummy hair loss. This is actually a disease of the hair roots where suddenly all your hair fall out on a spot on your body. Telogen Defluvium what a kind of resting phase content. Suddenly you lose a lot of hair and your hair goes into a kind of rest phase. You can lose hair by using medication and by a physical illness. It is always wise to determine what causes your hair loss before you start with any form of treatment.