According to the San Francisco Chronicle, severe gastrointestinal sickness can be caused by eating raw chicken. The bacteria salmonella is sometimes found as a contaminant in raw chicken. Consumption of salmonella often results in an illness called salmonellosis. Symptoms include severe diarrhea, cramping, nausea, headache, chills, fever, vomiting and fatigue.
As reported by the Better Health Channel, these salmonellosis symptoms generally occur within six to 72 hours after eating contaminated raw chicken. Symptoms can also result from consuming chicken that is undercooked.
The San Francisco Chronicle advises people to always cook chicken to an internal temperature of 165 degrees Fahrenheit and avoid cross-contamination of utensils and cutting boards.