Dripping Pine sap
A pine will ooze sap as it tries to heal a wound. Trees get small wounds all the time from wind banging branches together or breaking branches/twigs, animals and birds gnawing or pecking, disease, or insect activities. Unless you are seeing a lot of sap dripping, or more than is normal for that tree, you may be seeing the usual incidental sap flow that normally occurs. Here is our publication on pines, which includes a diagnostic chart and the symptom of sap flow: http://extension.umd.edu/sites/default/files/_images/programs/hgic/Publications/HG54_IPM_Series_Pine...
If you are seeing more sap than usual, you can send us photos of anything in the tree that you suspect may be causing the sap flow.
Or you can have an arborist look at it. We recommend using an arborist certified by the International Society of Arboriculture. They are usually employees of tree service companies. The companies do not charge to come out and merely look at the tree for diagnosis, just any work you hire them to do. To find an arborist, use this website: www.treesaregood.org