### process | reaction:

Allergic reaction
* Many allergic reactions are a mixture of more than one type of tissue damage.
* Most allergic reaction causes sickness
  - includes fatigue
  - leads to fevers
  - occurs at sites
* Most allergic reactions are rare
  - resolve within several days without dental or medical intervention
* Some allergic reaction causes nausea
  - respiratory problems
* Some allergic reaction includes headaches
  - hives
  - leads to death
  - occurs in patients
  - produces effects
  - relates to ingestion
* Some allergic reactions are emergencies
  - severe - asthma is the best known and one of the most serious
  - can be very serious and require immediate medical treatment
  - occur as a result of skin contact
* affecting the skin and gastrointestinal tract are rare.
* are also possible from internal use
  - quite possible
  - an example of hyper-sensitivity
  - extraordinarily rare
  - fairly common
  - hyperactive responses of the immune system to generally innocuous substances
  - inflammatory
  - infrequent
  - less common, but if untreated can be fatal
  - nature's way
* are possible after injection of the iodine-based dye
  - but uncommon
  - to any biological
  - rare but have been reported and can be severe
  - sometimes deadly
  - the most common complication from nail cosmetics
* are the most common health problem from mold exposure
  - problems associated with biological pollutants
  - triggers for asthma attacks
  - type of adverse effect of dental materials
  - only true side-effects and require special precautions
  - third type
  - typically the most common health problem
  - unusual
* are very complex but today they are relatively well understood
* can affect small areas or the entire body.
* can also occur with shiitake production but is less of a problem
* can be a problem and require desensitization
  - extremely mild, or deadly
  - life threatening
  - mild, life-threatening, or somewhere in between
  - minor to severe
  - severe and result in death
  - cause itching, redness, or other symptoms
  - develop on skin when rubberized clothing is worn
  - happen from within minutes to a few hours after eating the offending food
  - intensify when dogs and cats shed their winter coats in the spring
* can involve a rash, difficulty breathing and swelling of the face
  - several parts of the body at the same time
* can occur to any medication, but are quite rare with beta blockers
  - leech bites
  - under a variety of circumstances
* can occur with certain food additives
  - exposure to even small quantities of the allergen
  - herbal remedies just like other medications
  - lovastatin therapy
  - within minutes, or up to hours, or even days after eating food
* can range from harmless skin rashes to very serious breathing difficulties
  - mild to severe, in some cases causing death
  - simple discomfort to life-threatening situations
  - slight to serious shock
  - very mild rashes to anaphylactic shock
  - take place if a person is allergic to peanuts
  - trigger an asthma flare-up
  - vary depending on the level of sensitivity
* cause discomforts and in some cases life-threatening anaphylactic shock.
* caused by wasp bites in humans is well-known.
* common contraindication.
* do occur in some people, but they are rare.
* happens shortly after taking a substance.
* involve a special set of cells in the immune system known as mast cells
* is hypersensitivity reaction
  - illnesses
  - the primary risk of collagen
* make eyes itching, irritated and watering.
* occur in rare cases
  - sensitised persons
  - most commonly to pollen grains, dust, molds and foods
  - only after repeated exposure to a specific biological allergen
* occur when IgE binds to receptors on the surfaces of basophils and mast cells
  - the army overreacts at the time of re-exposure
  - with plasma component transfusions
  - within a few hours of getting the shot if they occur at all
* range from annoying to life-threatening
  - itchy noses and eyes to severe asthma attacks
  - merely bothersome to life-threatening
  - simple contact dermatitis to severe anaphylaxis
  - in severity and are usually treatable
* tend to become more severe, more complex, and more numerous if untreated.
* vary a lot
  - from person to person and can be very mild or very serious
  - in intensity depending on the level of sensitivity of the individual
  - with each individual's sensitivity