(July 11, 2011 - Insidermedicine) From Sweden - Upwards social mobility may reduce risk of high blood pressure, according to a report published in the Journal of Epidemiology and Community Health. Researchers examined data on 12,000 twins born between 1929 and 1958, whose parental occupations were recorded at birth. Results showed that low socioeconomic status was associated with a 42% increased risk of hypertension, while those who moved up the social ladder over two generations had nearly 20% reduced risk of hypertension.   From Denmark - People with contact allergies may be at reduced risk of cancer, according to a report published in BMJ Open. Researchers studied nearly 17,000 adults with contact allergies--allergies caused by direct contact with certain metals and chemicals. They found that those with these allergies were less likely to develop breast and non-melanoma skin cancers. And finally, from Boston - Secondhand smoke exposure may raise risk of childhood learning disorders, according to a report published in Pediatrics. Researchers studied over 55,000 children under 12 years of age, finding that those exposed to secondhand smoke had 50% increased risk of neurobehavioral disorders such as ADHD.