What caused Arthur's illness?

A Spit of Fate
The exact cause of Arthur Morgan's tuberculosis in Red Dead Redemption 2 is never explicitly stated in the game. However, there are several clues and theories that suggest possible factors:

1. Exposure to harsh conditions: Arthur's lifestyle as an outlaw, which often involves exposure to harsh weather, unsanitary conditions, and constant stress, could have weakened his immune system and made him more susceptible to illness.

2. Tuberculosis was prevalent in the Old West: Tuberculosis was a common disease during the time period the game is set in. Arthur's exposure to other infected individuals, especially in crowded or poorly ventilated areas, could have increased his risk.

3. Genetic predisposition: It's possible that Arthur may have had a genetic predisposition to tuberculosis, making him more likely to develop the disease.

4. Psychological stress: The constant stress and trauma Arthur experiences throughout the game, such as the loss of loved ones and the moral dilemmas he faces, could have negatively impacted his health.

Ultimately, the exact cause of Arthur's tuberculosis is left open to interpretation. However, it is likely a combination of these factors that contributed to his illness.