Hi, From past 3 days my head is feeling like when i touch it is sensing as hallow, when i bite my teeth also its being clearly observed as hollowness in my head. Even when i comb also i can feel the difference... As i understood from the other answers im trying to analyze what could be the issue, So would like to provide more details like i speak in mobile for a long time due to my work load, i did not had good sleep in past 6 months.. I am getting married, so please suggest me.. is this very serious or some medicines will cure this... Please suggest me.. Thanks alot for your support.