Hairfall could be due to numerous reasons. Excessive hair fall could be telogen effluvium. Acute or chronic based on the duration. It could be due to a recent viral fever, fad diet, weight loss,
thyroid disorders and many other factors.
Dandruff itself can cause local inflammation and hairfall could be secondary to that...
A dermatologist will be able to examine the scalp and will be able to able to know the cause of hairfall with proper history and examination.
Next Steps
consult a dermatologist