1 Heart-related lung problems. 2  Chest X-rays can show changes or problems in your lungs that stem from heart problems. 3  For instance, fluid in your lungs (pulmonary edema) can be a result of congestive heart failure.
A new report suggests that itâs generally safe for the average person to consume 400 milligrams of caffeine each a day. More than 90 percent of the worldâs population consumes caffeine in some form on a regular basis. The stimulant drug (yes, it is considered a drug) helps a person stay awake, alert and productive.
One cup of coffee a day, which is about 8 ounces and has around 100 milligrams of caffeine, or two cups of black or green tea per day is OK, says David. View Article Sources. SOURCES: Obstetrics & Gynecology, August 2010; vol 116: pp 467-468. News release, American College of Obstetricians and Gynecologists.