Jesus was in such emotional pain that He began to sweat blood. It's a very rare condition called thromboi haimatos that only occurs in times of extraordinarily intense stress. It leaves the skin tender and sore.
The scourging at the pillar.
The Jews had a law that a man could only be scourged to the count of 39. The Romans had no such restriction. If you look at the back of the Shroud you can see that Jesus' back must have been cut to to ribbons.
The crowning with thorns.
You may have seen the Spina Christi plant and been told that it is the plant that was used to make the crown of thorns. That's unlikely but the crown must have cost Our Lord tremendous pain. Scalp wounds bleed heavily and His face must have been covered with His precious blood.
carrying the cross
Artists traditionally show the cross already assembled when Jesus carries it but a full cross would've been too heavy for a man in Our Lord's condition to bear. He probably carried the cross beam on His shoulders and He must have fallen many times on the way to Golgotha.
the crucifixion
My Lord, my God, my Savior. What can I say? Only "thank you, thank you, oh thank you!"