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can be due to many reasons like mental stress;anaemia;deficiency of multivitamins and minerals;dandruff;thyroid problems;after fevers like typhoid/malaria;following surgeries or major illness;disease like alopecia
aerata and telogen effluvium
.Dryness of hair can be due lack of moisture but even diseases and mental stress can make hairs dry.Presently get investigated for thyroid;and anaemia and you can start on tablets of multivitamins and see after the report if you are anaemic then you will have to take iron tablets or syrups.Better to consult a Dermatologist
to find the problem and then treatment can be done accordingly.