Suggestive causes of the Black Death:

Suggestions varied alongside the main ideas of causes of illness of the day. Some blamed the four humours, others suggested this was punishment from God and few thought it had something to do with the aligning of the stars.

With these invalid explanations of the Black Death. Historians have discussed that the bubonic plague was mainly spread by rats, while a less popular argument relates to the spread of the disease due to close human contact.

Actual cause:

Spread from fleas from black rats
After being bit by a flea carrying the bacilli germ, large swelling developed called buboes
These appeared in the armpits and the groin
Fever and severe headache followed, before boils developed all over the body
Death occurred in a few days