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Hm it is mentioned but never confirmed to exist

Blackcough is mentioned once or twice throughout the POT series by Leafpool. ~Spottedgorse


It was mentioned in Moonrise by Mothwing as a form of chest infection (symptoms include coughing, expelling blood and high fever), though no cat has ever had it in the series


Yes, it's like cancer for cats. :| Jayfeather As if water was dripping… 20:29, August 20, 2015 (UTC)

It was the early term for greencough.—|| Grudgeholderr ||— 06:46, January 26, 2018 (UTC)