I have knee pain from running. what should i do?

See your doctor: If rest, ice and elevation for a short period of time does not help, i would have it evaluated by a physician.

Variable.: Start with rest, ice, compression, Ibuprofen and no running. If no better see a sports doc.

Strengthen: quadriceps muscles and tape your kneecap based on the direction it goes when your walk or run. This can be accomplished by seeing a sports training physical therapy program. If this isn't helping then consider evaluation by an orthopedic sports medicine specialist.