What is breakbone fever?

This 2006 photograph depicts a female Aedes aegypti mosquito while she was in the process of acquiring a blood meal from her human host, who in this instance, was actually the biomedical photographer, James Gathany, at the Centers for Disease Control. Researchers on May 17, 2007 published the genome -- a map of the genetic composition -- of the mosquito species Aedes aegypti, a connoisseur of human blood that spreads disease in tropical and sub-tropical locales worldwide. REUTERS/James Gathany/Centers for Disease Control/Handout (UNITED STATES). EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. NO SALES. NO ARCHIVES.

Some may call it breakbone fever, but we all know it as dengue fever.

MY daughter was recently diagnosed with dengue fever. She had a fever and a rash, and when we took her to the doctor, he sent us to the hospital because he said she had to be hospitalised. She is warded now and has been put on a drip. Is dengue fever dangerous?