Here's the format for this guide:

Ailment name
What it does
How you get it
How to cure it

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Asthma Attack
Ninten is asthmatic and can't do anything if he gets an asthma attack
Exhaust Gas
Use Asthma Spray, heals after battle

Blind
Character's hit % goes down
Darkness attacks
Heals after battle

Cold
Every eight steps you lose one HP
Talk to someone with a cold
Use Mouthwash, go to the hospital

Confusion
No control over the character
Enemy uses an attack with this effect
Heals randomly/after battle, use Noble Seed

Faintd
Character is dead and can't do anything
Losing all your HP
Hospital, Suprhealing

Paralysis
Character can't do anything
Paralysis attacks
Healing Beta, heals after finishing battle

Poison
Every eight steps you lose one HP
Enemy uses an attack with this effect
Use Healing Alpha, use an antidote, go to the hospital

Puzzled
Character day-dreams and does nothing
Enemy uses an attack with this effect
Heals randomly/after winning a battle

Sleep
Character is sleeping and does nothing
Hypnosis attacks
Healing Pi, heals randomly/after battle 

Stone
Same as sleep
StoneOrigin attacks
Healing Gamma, Healer

Tied Up
Character is tied up and can't do anything
Rope, Sticky Substance attacks
Heals randomly/after battle