Too much lead in your body can cause serious health risks. The greatest risk is to young kids (especially under the age of six) and pregnant and/or breastfeeding women. Ingesting lead can slow a child’s mental and physical development, creating new learning and behavior problems. In adults, lead can cause health problems, such as increased risks of heart disease, high blood pressure, kidney, or nervous system problems. The Environmental Protection Agency and other agencies focus on reducing lead exposure due to these risks.