I had thick and strong hair.but now they are falling at a rapid rate.is there any particular reason?

yes. for every action there is a reaction. the reaction in your case is the falling hair and the action is some deficiency in your body. i suggest aside from taking vitamin e, change your shampoo and conditioner or better don't use any instead shampoo your hair with coconut water. wash your hair thoroughly with water and dry it naturally. wipe with a clean towel then oil your hair thoroughly but not lavishly with 40% grapeseed oil, 30% vegetable oil and 30% of olive oil

I had thick and strong hair.but now they are falling at a rapid rate.is there any particular reason?

Side effect of a medication, perhaps.

I had thick and strong hair.but now they are falling at a rapid rate.is there any particular reason?

Do you eat healthy? that's one reason that people can lose hair or too much stress.