Image Source: bbc.co.uk

Symptoms of dengue fever appear suddenly after a period of incubation that lasts about five to eight days. It includes fever, chills, headache, eye pain, red eye, enlarge lymph nodes, a red flush to the face, lower back pain, extreme weakness and severe aches in the legs and joints.
The initial signs of illness last about two to three days. After this, the fever fluctuates and a rash appears in the arms, legs, and spreading to the chest and abdomen. The soles of the feet and the palms of the hands are swollen and turn red. The combination these characteristics of having fever, rash and headache are called the dengue triad. Although weakness and fatigue may last several weeks, most people recover fully from it. Once infected, the immune system keeps producing cells that prevent it from re-infection for about a year.