An anaphylactic attack or anaphylaxis is a severe type of allergic reaction. In the process of fighting a foreign agent, the body produces a large number of chemicals that cause harm to the body itself. About one fourth of the anaphylactic attacks seen do not have any specific cause. Certain medicines (e.g. Penicillin), an insect bite (e.g. bee sting), certain foods (e.g. peanuts) or certain products (e.g. Latex rubber) are some of the common trigger factors. Tick bite is known to aggravate red meat allergy and cause delayed anaphylaxis. For people who’re allergic to latex, condoms (especially when used during oral sex) could even lead to anaphylaxis.
It’s a very rare condition, the lifetime risk being roughly 1%. That is approximately 1 in 2000 people/year. Most people might not experience it in their lifetime at all. But its incidence is increasing, especially to food substances.