The symptoms of typhoid fever include: High Fever: The fever can start low and then increase, possibly reaching as high as 39.5-40°C Stomach Pain: Abdominal pain is a common symptom of typhoid fever. Diarrhea or Constipation: Severe diarrhea or constipation can occur as the disease progresses. In addition to these primary symptoms, other common manifestations of typhoid fever can include weakness, headache, loss of appetite, and in some cases, a rash of flat, rose-colored spots.