Food Allergy: For someone with a food allergy, eating or swallowing even a tiny amount of a particular food can cause symptoms such as skin rash, nausea, vomiting, cramping, and diarrhea. The best way to prevent a food allergy is to avoid the foods one is allergic to.

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Doctor's Notes on Food Allergy Symptoms

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Allergic Reaction

An allergic reaction is an overreaction to a harmless substance. Symptoms and signs of an allergic reaction include hives, rashes, swelling, itching, wheezing, nausea, and even anaphylactic shock in severe reactions. Treatment involves avoiding triggers, taking oral antihistamines, applying anti-inflammatory steroid creams, and using an EpiPen.
Hives and Angioedema

Hives are a sudden allergic skin reaction. Hives are raised reddish bumps that cause severe itching. Angioedema is similar to hives but the welts are larger and involve a deeper layer in the skin. Allergies, insect stings and bites, stress, exercise, and infections are common causes of hives and angioedema. In mild cases, no treatment is needed. Severe reactions should be treated by a health care professional.
Lactose Intolerance

Lactose intolerance is a condition in which milk and milk products (lactose products) are not digestible. Lactose intolerance is caused by a deficiency of lactase in the intestinal wall. Lactose intolerance may appear gradually after childhood. However, the condition can be present at birth. Common symptoms of lactose intolerance include: gas, bloating, abdominal pain, diarrhea, and nausea. The treatment for lactose intolerance are dietary changes to exclude products that contain lactase.
Low Blood Pressure

Low blood pressure (hypotension) may be caused by heart conditions, intravascular fluid complications (dehydration, pneumonia, vomiting, diarrhea, bleeding), medications, endocrine conditions, allergic reactions, orthostatic hypotension, diabetes, and micturition syncope. Low blood pressure may or may not have symptoms depending upon the cause. Treatment also depends upon the causes of low blood pressure.
Rash

A rash is a visible skin outbreak. Examples of noninfectious rashes include eczema, psoriasis, contact dermatitis, seborrheic dermatitis, rosacea, hives, and allergic dermatitis. Types of infectious rashes include ringworm, impetigo, scabies, herpes, chickenpox, and shingles. Rashes may be caused by fungi, viruses, bacteria, and parasites. Treatment depends upon the type of rash.
Severe Allergic Reaction (Anaphylactic Shock)

Anaphylactic shock is a severe allergic reaction that is life-threatening. The symptoms of anaphylactic shock are breathing problems, shock, or death. A severe allergic reaction may be caused by an insect sting or certain foods to which the body has been "sensitized" and has developed a powerful antigen for. Anaphylactic shock is an emergency and requires immediate medical treatment.
What Are The 4 Types of Allergic Reactions

Allergic reactions occur when the body’s immune system has a reaction to a substance it sees as harmful, called an allergen. The four general types of allergic reaction are immediate, cytotoxic, immune complex-mediated and delayed hypersensitivity.
Why Are My Lips Numb

A variety of conditions can cause lip numbness. Most commonly it's a symptoms leftover from local dental anesthetic, but autoimmune problems, cold exposure, stroke and Raynaud's syndrome are all potential reasons your lips are numb.

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Low Blood Pressure (Hypotension)

Low blood pressure (hypotension) may be caused by

heart conditions,
intravascular fluid complications (dehydration, pneumonia, vomiting, diarrhea, bleeding),
medications,
endocrine conditions,
allergic reactions,
orthostatic hypotension,
diabetes, and
micturition syncope.

Low blood pressure may or may not have symptoms depending upon the cause. Treatment also depends upon the causes of low blood pressure.

Expert Views and News

Food Allergy Topic Guide - Visuals

Quiz

Allergies Quiz
Slideshow

Allergy Triggers Slides
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Better Ways to Feed Your Baby
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Elimination Diet
Slideshow

Food Allergies Slides
Slideshow

Nasal Allergy Relief
Slideshow

Nasal Irrigation Slides

Food Allergy Topic Guide - Medications and Vitamins

Medications:

Epinephrine Injection

Epinephrine injection is used to treat severe allergic reactions (anaphylaxis) to insect stings or bites, foods, drugs, and other allergens.

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Diphenhydramine

Diphenhydramine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching,...learn more »