Sharp left nipple pain?

I have had a sharp piercing nipple pain for about 4 days now.  The areola is slightly swollen but with no redness.  There are no lumps anywhere.  I have 3 children and had a tubal 10 years ago, so possibility of pregnancy. It is very painful, even brushing my arm against my breast is painful.  Any suggestions of what may have caused this?  I think I am still too young for menapause, I'm 35.
Answers:

YOUR RULLING OUT PREGNACY ,, HAVE YOU CHANGED DITERGENT ETC ,, DIFFERENT CLIMATE OR TABLETS ,, DOC SAY CANCER CAUSES NO PAIN , COULD IT BE A CIST ,, KEEP A CHECK ON IT ,, IN MY PRAYERS , LOVE AND HEALING IS WISHED FOR YOU ,,


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