They say their findings show that even low levels of smoke may cause behavior problems in children with asthma or others at risk.

VOA: special.2009.01.13

And if you stir up a hornet's nest, you create trouble or problems.

VOA: special.2010.12.26

Andif you stir up a hornet's nest, you create trouble or problems.

VOA: special.2009.06.28

Most of the men died from syphilis, or problems from the disease.

VOA: special.2010.07.21

It can result from everyday situations or major problems.

VOA: special.2009.03.24

"Not one of them ever showed me that it would be easy and free of difficulty or problems.

VOA: standard.2009.10.08

Mr.Loughner did not have a record of crimes or mental problems that would have prevented him from buying a gun.

VOA: special.2011.01.15

This is especially true if they result from drugs,infection, sight or hearing problems, head injury,and heart or lung problems.

VOA: special.2009.09.15

Heat exhaustion may also produce a feeling of sickness, a fast heartbeat,breathing problems and pain in the head,chest or stomach.

VOA: special.2010.07.27

Possible effects of the diet include digestive problems, loss of fluids in the body, and development of kidney stones or gall stones.

VOA: special.2010.10.26

"Children who have emotional or developmental problems or who have mothers who have poor mental health are more likely to be bullies.

VOA: special.2010.05.06

But a drop in oxygen levels can cause a health emergency in people with heart or lung problems.

VOA: special.2009.07.14

They may have a weak or damaged heart, high blood pressure or other problems of the blood system.

VOA: special.2010.07.27

They also say persons with heart or lung problems should seek advice from their doctor before flying.

VOA: special.2009.07.14