Researches tell that people have allergy of specific food will show uncomfortably symptoms. Such as allergy of berries or sea shell can cause reddish and itchy skin.
Observation about food allergy shows that there is a relation between allergy and addiction. Food makes body react uncomfortably and try to adapt to itself. At the beginning, heart pulse and breathing become faster and sufferer will be tense, sweat, pale and even pain. Second, the body will try to cope with the symptoms, so it will reach immunity and the sufferer will get better when all symptoms have reduced. Third, a certain period of tired phases, when food causes allergy can be eaten again with no more uncomfortably effects against the person.
According to the researches, many kind of allergy reaction affected by food may be a connection with genetically factor. Most people think that allergy leads to reaction like cough, cold, sneeze, tearing is caused by allergens (causal factor of allergy) have been sucked in, such as come from animal hair or grass.
In some people, reaction of allergy rise on skin: become reddish, itchy and nodules, and can also cause swelling around eyes and mouth. In most people, allergy reaction is centered at digestion duct which lead to nausea, vomit and diarrhea, then. However, the most reaction arise is a kind centered in respiration tract mucous that affect a swelling, so then obstruct the respiration pipe (breathe hardly that make a sound) and runny-nosed. Then, this condition often cause cold and mucus cough.
That is why people who has allergy of sea shell breathe hardly and when they take a breath it will make a sound. And people who have allergy of shrimp can suffer swelling around the area of their mouth.