Diseases and injuries

Whitecough is described as a mild chest cough. 

Herb Remedies
Fevers occur with whitecough, so medicine cats use tansy for the fever. Catmint is used when the whitecough becomes more severe, and turns into greencough. Cloudspots, the ThunderClan medicine cat a long time ago, found out that catmint (also referred to as catnip), was the best cure for the chest infection. Many cats have been affected by whitecough, including Bluestar, Millie, and the other cats in Long Shadows, when the Firestar came up with the idea to move the sick cats to the abandoned Twoleg nest.

When whitecough becomes more severe, it will eventually turn into greencough.

Greencough is an epidemic that is described as an infected cough caused by fungi in the Warriors series. Whitecough is a lesser version of greencough, but if it becomes severe, it came become greencough. The best remedy is catnip, or more commonly known as catmint. It can be found near Twolegplaces or in Twoleg gardens.

Victims

In the Original Series

Fire and Ice
 * Bluestar (ThunderClan) - loses one of her lives.
 * Brindleface's two kits (ThunderClan)- die

In the New Prophecy Series

Sunset
 * Heavystep (RiverClan) - supposedly dies but is mentioned in later books in the allegiances. It is likely that Erin Hunter made a mistake.

In the Power of Three Series

The Sight
 * Poppypaw (now Poppyfrost) (ThunderClan) - recovers - nearly joins StarClan but Jaypaw (now Jayfeather) brings her back.
 * Ferncloud (ThunderClan) - recovers
 * Mousefur (ThunderClan) - recovers
 * Molepaw (ThunderClan) - dies
 * Unknown Elder (ShadowClan) - dies (it is stated that a ShadowClan elder died, but the name is never mentioned).

Note: On page 323, Leafpool says "There is greencough in all of the Clans". Because specific names were not mentioned, this list is limited to the cats that were confirmed by name.

Long Shadows Note: Nearly half the cats in ThunderClan get infected in a greencough outbreak. Because of this, some cats might not be listed.
 * Firestar (ThunderClan) - loses one of his lives.
 * Millie (ThunderClan) - recovers.
 * Briarkit (ThunderClan) - recovers.
 * Honeyfern (ThunderClan) - recovers.
 * Poppyfrost (ThunderClan) - recovers.
 * Rosekit (ThunderClan) - recovers.
 * Thornclaw (ThunderClan) – recovers.
 * Longtail (ThunderClan) - recovers.
 * Dustpelt (ThunderClan) - recovers
 * Cloudtail (ThunderClan) - recovers
 * Brightheart (ThunderClan) - recovers
 * Heavystep (RiverClan) - dies even though he had already doed of grencough in Sunset. Even after "dying twice", he is still listed in the allegiances.

Sunrise
 * Spiderleg (ThunderClan) – recovers (started coughing in Long Shadows, but it wasn’t confirmed as greencough until later).

In the Super Editions

Bluestar's Prophecy
 * Poppydawn - dies (See In the Code of the Clans)

In the Field Guide Series

Code of the Clans


 * Snowstar (ShadowClan) - loses last life.
 * Brightwhisker (ShadowClan) - dies before she can travel to the Highstones to get her nine lives.
 * Poppydawn (ThunderClan) - dies (Note: In Code of the Clans, the part that says that she dies is an excerpt of Bluestar's Prophecy).