Recent Blog Articles
Can flavonoids help fend off forgetfulness?
Can physical or cognitive activity prevent dementia?
Wondering how much your medical care will cost? New rules could help
Long-lasting healthy changes: Doable and worthwhile
The sore throat checklist: What parents need to know
A new treatment for obesity
Remember the flu? Yep, it's that time again
3 ways to build brain-boosting social connections
Grandparenting: Ready to move for family?
Wondering about COVID-19 vaccines if you’re breastfeeding?
Busting myths about poison ivy, from the Harvard Health Letter
Poison ivy poses real problems to gardeners and outdoor enthusiasts. But some of the "facts" that people know about this plant are really myths, reports the May 2013 Harvard Health Letter.
Plants employ a variety of defenses to protect themselves. Poison ivy, poison oak, and poison sumac secrete an oil that some people are allergic to. Contact with the oil triggers an allergic reaction that shows up in two to 10 days as a red, swollen, itchy, blistering rash known as allergic contact dermatitis.
To continue reading this article, you must log in.
Subscribe to Harvard Health Online for immediate access to health news and information from Harvard Medical School.
- Research health conditions
- Check your symptoms
- Prepare for a doctor's visit or test
- Find the best treatments and procedures for you
- Explore options for better nutrition and exercise
I'd like to receive access to Harvard Health Online for only $4.99 a month.Sign Me Up
Already a member? Login ».
As a service to our readers, Harvard Health Publishing provides access to our library of archived content. Please note the date of last review or update on all articles. No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.