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The National Institute of Environmental Health Sciences (NIEHS) is one of the lead research agencies studying the environmental causes of Parkinson’s disease, a neurodegenerative disease thought to be caused by the interaction of genes and environment.

Sleep plays a vital role in good health and well-being throughout your life. The way you feel while you are awake depends in part on what happens while you are sleeping. During sleep, your body is working to support healthy brain function and maintain your physical health. In children and teens, sleep also helps support growth and development. Getting inadequate sleep over time can raise your risk for chronic health problems. It can also affect how well you think, react, work, learn, and get along with others. Learn how sleep affects your heart and circulatory system, metabolism, respiratory system, and immune system and how much sleep is enough.

Applications are being accepted for CDC's July 2015–June 2017 Epidemic Intelligence Service (EIS) program. EIS is a 2-year, postgraduate program of service and on-the-job training for health professionals interested in the practice of epidemiology. Each year, EIS selects approximately 80 persons from applicants around the world and provides them with opportunities to gain hands-on experience in epidemiology at CDC or at state or local health departments.

Regular physical activity can help you lose excess weight; improve physical fitness; lower many heart disease risk factors such as “bad” LDL cholesterol levels, increase “good” HDL cholesterol levels, and manage high blood pressure; lower stress and improve your mental health; and lower your risk for other conditions such as type 2 diabetes, depression, and cancer. Even modest amounts of physical activity are good for your health.

How’s the health in your state? Find out how CDC’s Behavioral Risk Factor Surveillance System works year-round to provide the information experts need to answer this important question.

Secondhand Smoke Fact Sheets.

Treatment for children with non-Hodgkin lymphoma (NHL) generally involves combination chemotherapy for most patients. The use of radiation therapy is limited in children with NHL. Get detailed treatment information for childhood NHL in this summary for clinicians.

Grief, bereavement, and coping with loss are common issues in cancer survivors, their loved ones, and caregivers. Get detailed information about grief and bereavement in adults and children and psychosocial and pharmacologic treatment in this clinician summary.

Hereditary colorectal cancer syndromes include Lynch syndrome and several polyposis syndromes (familial adenomatous polyposis, MUTYH-associated polyposis, juvenile polyposis syndrome, Peutz-Jeghers syndrome, and serrated polyposis syndrome). Learn about the genetics, clinical manifestations, management, and psychosocial aspects of these and other hereditary colon cancer syndromes in this expert-reviewed summary.