On Sefer HaHinuch, Mitzva #49, Rabbi Eli Mansour explains:
The Gemara specifies five separate payments which one is required to
pay if he caused his fellow bodily harm: Nezek, Sa’ar, Ripui, Shebet,
Nezek refers to the person’s loss of value as a result of a permanent
injury caused to him by his fellow. If, for example, he lost a limb,
Heaven forbid, then there are certain jobs which he is no longer
capable of performing. Bet Din therefore assesses the victim’s value
if he would be sold as a servant before suffering the injury, and his
value now, after the injury, and the guilty party is required to pay
Sa’ar means “pain,” and it refers here to the amount of money a person
would be willing to pay in order to be spared the pain suffered by the
victim. This amount must be paid by the guilty party.
Ripui refers to the medical expenses incurred as a result of the
Shebet refers to the victim’s loss of income. If he lost worktime
because of the injury, then the guilty party must pay him the amount
of money he would have earned during the time he was unable to work.
Finally, if the victim suffered embarrassment as a result of the
injury, then Bet Din makes an assessment of the value of this
embarrassment, and the guilty party must pay this amount, as well.