The acute phase usually begins with a sudden high fever that can last up to ten days. The fever is usually above 39 °C (102 °F), and can sometimes get as high as 40 °C (104 °F). About half of people with chikungunya get a rash, usually about two to five days after symptoms start. Some people also have gastrointestinal symptoms, like abdominal pain, nausea, vomiting, or diarrhea. In rare cases, people may get conjunctivitis or other problems with their eyes.