Fatal Wounds
Fatal Wounds decrease the unit's current Health each turn. The number of Fatal Wounds determine the amount that are lost. For instance, a soldier with 2 Fatal Wounds will lose 2HP per turn. Using the Medi-Kit will heal Fatal Wounds and restore some Health. Quickly healing a wounded soldier may also mean less wound recovery time (back at base), because recovery time is based on health at the end of the mission.
Each wound also applies a -10% penalty to your accuracy, down to but not below -90%. This means that someone with 100 base firing accuracy who has 9 or more wounds will be left with a base accuracy level of 10 points, in addition to the health percentage modifier.
Warning: Unconcious soldiers still take wound damage and CAN DIE if not treated. So if one of your soldiers is knocked unconscious by shots or explosions (as opposed to a stun bomb), it is important that you immediately run a diagnostics scan on the soldier with your medikit and heal any wounds immediately. See Medi-Kit and Unconscious Soldiers for more information on how to do this. Keep in mind that you can pick up and move (or even throw) someone, if you have a man down in a hot zone.