Food intolerance is not caused by the immune system and usually has a delayed reaction of several hours after eating the food. Symptoms include gastrointestinal bloating, diarrhea, vomiting and skin rashes. Food intolerance can have a number of different causes, so it is important to know what those foods are to get to the underlying condition.

Common reactions include:

• gastrointestinal problems
• headaches
• coughing
• rashes
• muscle aches
• fevers