Hello and welcome to healthcaremagic More than anything else, it is the recent history of Dengue which is likely the most significant factor responsible for increased hair shedding(Telogen Effluvium). Telogen is the resting phase of hair growth cycle. After any stressful event e.g medical illness like dengue, typhoid etc the hair gets shifted from the growth phase (anagen) to resting phase (telogen) which is manifested as increased shedding. Telogen usually begin 3 months after the stressful event and can last upto 6 months following which the hair follicle re-enters the growing phase. Attention to nutrition, an Iron supplement and a Biotin supplement would be advisable for faster recovery from telogen. regards