Where are we on the tall, strong, and stoic character falling ill and being so unintentionally good at being discreet that no one catches on to their ailment until they're on the verge of collapse or until a particularly strong sneeze or cough is wrenched from their being.
Like they're not even trying to hide their symptoms, but they're just naturally so stoic and reserved they just. Don't. Until they practically can't anymore.