It is possible to receive Status Abnormalities from enemy attacks.
Some examples of these effects and their respective cures are listed
below.

Status Abnormalities which remain after battle

Poison – HP decreases with activity. Cure with Antidote (item).

Petrify – Character cannot participate in battle. Recover with Soft
(item).

Darkness – Physical Attack Hit Rate decreases. recover with Eye Drops
(item).

Silence – Character cannot use the , , or
commands. Recover with Echo Screen (item).

* The above abnormalities (Poison, Petrify, Darkness, and Silence)
may also be cured with Remedy (item) or Esuna (magic).

Zombie – Recovery items and magic effects deal damage. Recover by
using Holy Water (item) or Dispel (magic).

KO – Once the HP of a party member reaches 0, that party member
can no longer participate in the battle. Recover with
Phoenix Down (item) or Recovery magic.

Status Abnormalities during battle

Sleep – ATB Gauge stops when the character falls asleep. Recover
when hit by Physical Attacks or with the passage of time.

Curse – Limit Breaks cannot be activated. Recover with the
passage of time or with Holy Water (item).

Berserk – Character will attack enemies automatically. The player
will have no control over the character.

Confuse – Commands will be randomly selected. The player will have
no control over the character.

* The above abnormalities (Sleep, Curse, Berserk, and Confuse) may
also be cured with Remedy (item) or Esuna (magic).

Slow – The ATB Gauge decreases its speed. Recover with the
passage of time, Esuna (Magic), or Haste (Magic).