What Is Histamine? Histamine is an important part of your bodyâs immune response, but high levels of the chemical compound can cause health problems. Histamine is a chemical produced in cells throughout the body as part of the bodyâs inflammatory response to allergy, infection, or injury. When damaged or exposed to allergens, cells in the skin, nose, throat and lungs release histamine, resulting in pain, itchiness, redness, runny nose, and wheezing.
WASHINGTON Mom-to-be closing in on her due date? The nation's obstetricians are getting more precise about exactly how close makes for a full-term pregnancy. On average, a pregnancy lasts 40 weeks, counting from the first day of the woman's last menstrual period. That's how a due date is estimated. A baby is considered preterm if he or she is born before 37 weeks of pregnancy. Until now, a term baby was defined as one born anytime from 37 weeks to 42 weeks, a few weeks before or after the calculated due date.
Pregnancy typically lasts for 40 weeks and is calculated from the first day of the last menstrual period. In women, a full-term pregnancy means that a baby has developed properly and is ready to be born without any potential health problems. Research has shown there is very little difference, if any, in terms of health between babies born at 39 or 40 weeks of gestation.