A tree nut allergy is when a person has an allergic reaction to the proteins found in tree nuts. Tree nuts are large, edible seeds of trees. When an allergic person comes into contact with a tree nut protein, (usually by eating, but less commonly by touching or inhaling the protein) the immune system triggers an allergic cascade. This reaction has the potential to be deadly.

There is no cure for a tree nut allergy. The only effective way to prevent an allergic reaction is the complete avoidance of tree nuts and foods with tree nuts or its products (e.g., nut oils).

There are many different kinds of tree nuts. Some common tree nuts are almonds, cashews, pecans and walnuts. People who are allergic to one type of tree nut may also be allergic to another type. People who are allergic to tree nuts may also be allergic to peanuts, though it should be noted that peanuts are not actually nuts, but a type of legume (bean).

According to the American Academy of Allergy, Asthma and Immunology (AAAAI), about 3 million Americans are allergic to tree nuts and/or peanuts. These allergies are severe enough to kill more than 100 people every year.

Symptoms of tree nut allergies usually include:

• Swelling
  
  
• Hives
  
  
• Itchiness
  
  
• Redness
  
  
• Nausea
  
  
• Stomach pain
  
  
• Wheezing
  
  
• Runny nose
  
  
• Tingly tongue

Anyone who suffers from a tree nut allergy is susceptible to the severe and potentially deadly allergic reaction known as anaphylaxis. Therefore, individuals with tree nut allergies may be advised to carry an epinephrine shot with them at all times.