Hello... hairfall may be genetic or due to changes in weather,water type- bore well water, food intake as in protein insufficiency, calcium deficiency, anaemia etc... I need to examine you for that...its better you consult a dermatologist... Make sure to have protein rich diet..have good green leafy vegetables,nuts,  dry fruits etc..drink plenty of water too..Apart from that make sure that you don't suffer from dandruff as that will also cause hairfall..You can use coconut oil after warming it slightly..Try to use medicated shampoo..