Also referred to as Red 40 or food coloring #2, red dye is a food coloring and preservative that may cause itchiness or hives, gastrointestinal difficulties, respiratory problems and anaphylactic sock in sensitive indivi... More »

It has not been determined if red dye 40 is toxic to humans. Studies have been done to determine the effects of red dye 40 on rats and mice, but there is not conclusive evidence that the dye is toxic to humans, according... More » Science Chemistry

Chocolate allergy symptoms include abdominal upset, stuffy nose, watery eyes, migraines, hives and lightheadedness, according to HowStuffWorks. Symptoms can also manifest as swelling in the mouth, vomiting, diarrhea, sne... More » Health Conditions & Diseases Allergies

According to the Southwest Allergy and Asthma Center, one symptom of a rice allergy is usually hives (a red rash that itches) that manifest after a few minutes of a person eating rice or a food with rice. However, sympto... More »

According to the Asthma and Allergy Foundation of America, the symptoms of ragweed allergy may include stuffy or runny nose, sneezing, eye irritation, puffy eyes, and itchiness in the nose and throat. People who have sev... More » Health Conditions & Diseases Allergies

The symptoms of a tomato allergy include eczema or hives, stomach cramps, vomiting, and facial swelling, according to Healthline. Other symptoms sometimes occur, such as diarrhea, itchy throat, sneezing, wheezing or a ru... More » Health Conditions & Diseases Allergies

WebMD reports that walnut allergy symptoms can include hives, swollen skin, itching inside the ear and mouth, swollen lips, breathing difficulty, chest pain, difficulty swallowing and confusion. Walnut allergies can also... More » Health Conditions & Diseases Allergies