Flowersmoke redcough basically when he at his all time worse. 

So they never tell us what Redcough is do they? Is it tuberculosis in cats or simply a bloody cough that kills. I think it like Tuberculosis in cats. 

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Symptoms from my trusted source, Mayo Clinic

Coughing for three or more weeks

Coughing up blood or mucus

Chest pain, or pain with breathing or coughing

Unintentional weight loss

Fatigue

Fever

Night sweats

Chills

Loss of appetite

Tuberculosis can also affect other parts of your body, including the kidneys, spine or brain. When TB occurs outside your lungs, signs and symptoms vary according to the organs involved. For example, tuberculosis of the spine might cause back pain, and tuberculosis in your kidneys might cause blood in your urine.

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So basically slowly Flowersmoke will feel pain in his chest and basically be in pain when breathing, bloody cough, A fever, loss of appetite and weight loss, he also can barely move due to the pain. He always did have a weak immune system