National Dengue Control can progress rapidly, so recognizing early warning signs is crucial. Here are 7 important indicators: Sudden high fever: frequently falling between 38.9°C and 40.6°F (102°F to 105°F). Severe headache: Often described as a throbbing pain behind the eyes. Muscle and joint pain: Intense pain, sometimes described as feeling like your bones are breaking. Nausea and vomiting May be persistent and severe. Loss of appetite: Feeling little or no desire to eat. Skin rash: May appear 2-3 days after the fever starts, often with a flushed face and red spots on the arms and legs.