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Is this topic for you? This topic has general information about food allergies. If you would like more specific information about peanut allergy, see the topic Peanut Allergy. What is a food allergy? When you have a food allergy, your body thinks certain foods are trying to harm you. Your body fights back by setting off an allergic reaction. In most cases, the symptoms are mild—a rash, a stuffy nose, or an upset stomach. A mild reaction is no fun, but it is not dangerous. A serious reaction can be deadly. But quick treatment can stop a dangerous reaction. Allergies tend to run in families. You are more likely to have a food allergy if other people in your family have allergies like hay fever, asthma, or eczema (atopic dermatitis). Food allergies are more common in children than adults. About 7 out of 100 kids have them. Only about 2 out of 100 adults do.1 Children often outgrow their food allergies. But i ...

What is fine-needle aspiration? Fine-needle aspiration is a method of collecting cells from the breast, liver, mouth, neck, lymph nodes, genitals, respiratory tract, or thyroid to look for signs of cancer, infection, or other conditions. A health professional inserts a thin needle into a lump and withdraws a sample of cells or fluid. The material is then examined under a microscope. Fine-needle aspiration may be the only test you need to find out whether a lump is cancerous; however, in some cases, you may have another procedure, such as a core needle biopsy or an open biopsy. In a core needle biopsy, you will have local anesthetic to numb the area. The doctor places the core needle—which is larger than the needle used in an aspiration—into the lump. Then he or she takes out a thin section of tissue, rather than a few cells. In an open biopsy, a doctor uses a surgical knife to remove a sample of tissue.