Trees have no brains or central nervous systems to feel pain, and there is insufficient evidence to suggest otherwise.
According to the Institute for Applied Physics in Germany, plants release gases that are equal to crying. Researchers picked up sound waves when they were cut using a laser-powered microphone. They were not audible to the human ear, and they responded with several defense mechanisms. The scientists found that the plants began to emit ultrasonic sounds between 20 and 100 kilohertz, which they believed could convey their distress to other organisms and plants.
Animals and humans have a nervous system to feel pain, but plants don't have a nervous system, so they can't feel pain. However, there are not enough peer-reviewed studies and necessary evidence to consider the above as facts.