Bruce Lee died on July 20, 1973, in Hong Kong at the age of 32. The cause of his death has been a matter of speculation for decades. Initially, his death was officially ruled to be the result of cerebral oedema. However, a new study published in 2022 by kidney specialists suggests that Lee died from hyponatremia, an abnormally low sodium concentration in ones blood, which can lead to cerebral oedema and death within hours if excess water intake is not matched by water excretion in urine. The study hypothesized that Lee had multiple risk factors for hyponatremia, including chronic fluid intake, use of marijuana, and documented factors that may have interfered with his kidneys function, such as prescription drugs, alcohol intake, and a history of injuries to the organ. Another theory is that Lee died from an allergic reaction to a headache medication, which caused swelling of the brain.