Headache

Cold

A headache is fairly uncommon with a cold.

Flu

A headache is very common with the flu, present in 80% of flu cases.

Information above is just a generalization of different symptoms between a cold and the flu. The contents above are just standard guidelines and your symptoms may be different. Dehydration can sneak up on you so always seek a heath care professional if your symptoms are severe or last longer than usual. - - Info provided by http://www.squidoo.com.