There are several competing theories about what may have actually caused Mozart's death, including:
1. Rheumatic fever: This is a bacterial infection that can affect the heart, joints, and other organs. It was a common cause of death in the 18th century, and some experts believe that Mozart may have contracted it from his wife, Constanze, who had been ill with a similar illness a few months earlier.
2. Bacterial infection: Another possibility is that Mozart died from a bacterial infection, such as typhoid fever or tuberculosis. Both of these diseases were prevalent in Vienna at the time, and Mozart's symptoms, including fever, rash, and delirium, are consistent with either of these infections.
3. Poisoning: Some people believe that Mozart may have been poisoned, either intentionally or unintentionally. There is no evidence to support this theory, but it has been suggested that Mozart's rivals or enemies may have wanted to harm him.
4. Overwork: Mozart was a prolific composer and performer, and he often worked long hours. Some people believe that his death may have been caused by exhaustion or stress.
5. Medical malpractice: It is also possible that Mozart's death was caused by medical malpractice. At the time, medical knowledge was limited, and doctors often used treatments that were ineffective or even harmful. Some experts believe that Mozart's doctors may have given him the wrong medication or treatment, which could have contributed to his death.
The true cause of Mozart's death is likely to remain a mystery. However, his untimely death at the age of 35 cut short a brilliant career and left a lasting legacy of beautiful music.