A person normally, experiences hair fall of around 50-100 strands in a day. Excessive hair fall occurs when you lose more than 100 strands in a day. These numbers may show some latitude, so if you experience more strands falling than your usual fall, you should take notice. This happens because more hair follicles move in to “telogen” or the shedding phase.
You should try a hair pull test. Hold a handful of hair at the top of your hair and pull. If you see more than 5-10 strands in your palm, you have excessive hair fall.