[header] How to ease glandular fever symptoms [title] Increase your fluid intake. [step] When you have a fever, your metabolism increases and makes use of more water. The body tries to regulate the temperature inside you by making the stored water evaporate through sweat to cool you off. 
These two factors combined lead to dehydration. Thus drinking more than 10 glasses of water a day is recommended in order to replace the lost fluids.