Nipple Discharge

Two nights ago I woke up and had a wet spot on my shirt, right where my nipple is.  The spot was about the size of a penny.  The discharge didn't leave a stain,  it was colorless.  It looked almost as if my nipple had sweat.  I am really nervous.  I am a 30 year old female.  It hasn't happened since then.  Is this cause for alarm.

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Dear alwaysnervous:  Nipple discharge is most often from benign conditions. Some women are more prone to more discharge including women on; birth control pills, certain blood pressure medications or on major tranquilizers. These medications increase prolactin levels in the body. There is also certain life periods when a person is more likely to get discharge than others: there may be more discharge at puberty and at menopause than the years in-between.

Since this was a one-time occurrence, you may just want to monitor the situation.  However, the following are general parameters.  The time to worry about nipple discharge is when it