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.
How Much Caffeine Is Safe? It seems that experts who study caffeine agree that consuming up to 300 milligrams of caffeine per day is safe -- for adults anyway. That's roughly the amount of caffeine you would get from three cups (not mugs or big paper cups) of coffee.