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.
Drinking caffeine in moderate amounts, such as three 8-ounce cups of coffee or 250 milligrams a day, is considered safe according to the National Institutes of Health. Be aware that even as little as 100 milligrams a day can make you caffeine-dependent, according to KidsHealth.org.