Excessive phlegm or chest mucus is often caused by viral or bacterial infections such as influenza, bronchitis and pneumonia, as well as irritants such as those inhaled during smoking. When infections are treated with antibiotics, the natural balance of the body becomes compromised.
Giving whole blood requires a waiting period of 56 days between donations; however, all we ask is for individuals to Commit for Life and donate once every quarter. If you donate plasma (your red cells are returned to you), you may donate every 28 days.
Best Answer: There are tips that the American Red Cross gives for before, during and after a blood donation. It's located at: http://www.givelife2.org/donor/tips.asp While it says to wait at least 5 hours before any strenuous activities, I would definitely wait a little longer.