Hypersensitivity definition

It is important to remember that there is no official highly sensitive person diagnosis, and being an HSP does not mean that you have a mental illness. High sensitivity is a personality trait that involves increased responsiveness to both positive and negative influences. High sensitivity applies across a few different categories. There are several traits or characteristics common to HSPs, according to the researchers who identified this personality trait: • Avoiding violent movies or TV shows because they feel too intense and leave you feeling unsettled • Being deeply moved by beauty, either expressed in art, nature, or the human spirit, or sometimes even a good commercial • Being overwhelmed by sensory stimuli like noisy crowds, bright lights, or uncomfortable clothing • Feeling a need for downtime (not just a preference), especially when you have hectic days; needing to retreat to a dark, quiet room • Having a rich and complex inner life, complete with deep thoughts and strong feelings that go with them It is less common to be a highly sensitive person, and society tends to be built around people who notice a little less and are affected a little less deeply. Highly sensitive people may benefit from finding ways to cope with the stresses they often face. This is true for those who recognize themselves as highly sensitive as well as those who have a loved one who is more sensitive than the average person. High sensitivity exists in at least 100 other species aside from h...

Hypersensitivity pneumonitis (HP) is a type of allergic reaction that causes inflammation in your lungs. Bacteria, fungi, animal and plant proteins, and other allergens can cause HP. Acute hypersensitivity pneumonitis can get better, but chronic hypersensitivity pneumonitis can cause irreversible lung damage and scarring. Overview What is hypersensitivity pneumonitis? Hypersensitivity pneumonitis (HP) is a type of allergy that causes inflammation in the small air sacs of your lungs (alveoli). Your symptoms can be immediate (acute) and go away quickly, or they may develop over time and become ongoing (chronic). Chronic hypersensitivity pneumonitis is considered an What is the difference between hypersensitivity pneumonitis and other allergies? Hypersensitivity pneumonitis causes a different immune reaction in your body than pollen or pet allergies. Unlike common allergies that cause hay fever and asthma, repeated exposure to allergens that cause HP can lead to inflammation that can permanently damage your lungs. Who does hypersensitivity pneumonitis affect? You’re at higher risk for hypersensitivity pneumonitis if you work in certain occupations or are around specific allergens. You’re more likely to develop HP if you: • Work on a farm (for instance, with cattle or vegetables). • Handle animals (veterinarians, bird or poultry handlers). • Process and load grains or flour. • Work in lumber mills or strip wood. • Manufacture wallboard and paper. • Are a metal worker. • Are ar...

• Hypersensitivity reactions are exaggerated immune responses to allergens. • There are four types of hypersensitivity reactions. Types I through III are mediated by antibodies, while type IV is mediated by T cell lymphocytes. • Type I hypersensitivities involve IgE antibodies that initially sensitize an individual to an allergen and provoke a quick inflammatory response upon subsequent exposure. Allergies and hay fever are both type I. • Type II hypersensitivities involve the binding of IgG and IgM antibodies to antigens on cell surfaces. This induces a cascade of events that leads to cell death. Hemolytic transfusion reactions and hemolytic disease of newborns are type II reactions. • Type III hypersensitivities result from the formation of antigen-antibody complexes that settle on tissues and organs. In an attempt to remove these complexes, underlying tissue is also damaged. Serum sickness and rheumatoid arthritis are examples of type III reactions. • Type IV hypersensitivities are regulated by T cells and are delayed reactions to antigens associated with cells. Tuberculin reactions, chronic asthma, and contact dermatitis are examples of type IV reactions. Hypersensitivity reactions are categorized into four major types: type I, type II, type III, and type IV. Type I, II, and III reactions are the result of This image is depicting hay fever showing pollen grains (yellow) entering the nasal cavity (left) of a hay fever sufferer. The symptoms are caused by a massive relea...

delayed hypersensitivity (DH) ( delayed type hypersensitivity (DTH)) the type of hypersensitivity exemplified by the tuberculin reaction, which (as opposed to immediate hypersensitivity) takes 12 to 48 hours to develop and which can be transferred by lymphocytes but not by serum. Delayed hypersensitivity can be induced by most viral infections, many bacterial infections, all mycotic infections, and a few protozoal infections (leishmaniasis and toxoplasmosis). The scope of the term is sometimes expanded to cover all aspects of cell-mediated immunity including contact dermatitis, granulomatous reactions, and allograft rejection. immediate hypersensitivity antibody-mediated hypersensitivity occurring within minutes when a sensitized individual is exposed to antigen; clinical manifestations include systemic anaphylaxis and atopic allergy (allergic rhinitis, asthma, dermatitis, urticaria, and angioedema). The first exposure to the antigen induces the production of IgE antibodies (cytotropic antibodies, reagin) that bind to receptors on mast cells and basophils. Subsequent exposure to the antigen triggers production and release of a diverse array of mediators of hypersensitivity that act on other cells producing symptoms such as bronchospasm, edema, mucous secretion, and inflammation. a local or general reaction of an organism following contact with a specific allergen to which it has been previously exposed and sensitized; immunologic mechanisms gives rise to inflammation or ti...