Having abusive parents can lead to higher stress and likelihood of developing age-related diseases like cardiovascular disease.
If your parent was drug-dependent, you may have ended up having to take care of them as a child — which can cause problems with having fun as an adult.
Or, depressed parents may lead children to act like they're happy. This can lead to a hesitation to open up emotionally in adulthood.
Over-involved "helicopter" parenting during childhood has been linked to anxiety problems in adolescence — and even the abuse of pain pills.
Over-involved parenting also may lead to feelings of entitlement and less self-efficacy when you get older.
Stressed out or emotionally abusive parents lead to children with higher levels of "defenses" to shield them from experiencing pain. These traits carry on into adulthood and lead to trouble nurturing their own children.