Knee pain no injury feels like pressure in my knee knee cap & back of knee pain hurts to do anything what gives?

Possibilities are: Injury or inflammation in the knee ligament, cartilage, patella, tendon and soft tissues around the joint. Your dr can give you an accurate diagnosis. You had all the necessary tests/ imaging studies done. Ask your dr. For reassurance. Take care!

Common: Bending or using the knee too much, arthritis , bursitis, a collection of fluid in the knee, a tear in the meniscus, a tear in a ligament, muscle strain, conditions that don’t involve the knee(hip, other), knee injuries, a knee joint infection, or a condition called gout, which causes crystals to form inside joint.

Patellar pain.: It could be patellar (kneecap) pain. See a non-surgical sports medicine specialist to get an accurate diagnosis, you may require physical therapy.