The phrase "a combination of causes" is correct and usable in written English.
It can be used when discussing multiple factors or reasons that contribute to a particular outcome or situation.
Example: "The decline in bee populations can be attributed to a combination of causes, including pesticide use, habitat loss, and climate change."
Alternatives: "a mix of factors" or "a blend of reasons".
Traders and analysts said the sell-off had a combination of causes.
Neurological damage could result from a combination of causes, including co-infection with another virus, environmental factors or something else entirely.
Structural systems are usually subjected to degradation processes due to a combination of causes, such as design or constructive problems, unexpected loadings or natural ageing.
Since many people died of a combination of causes, it was impossible to figure exactly how many were killed by each cause, but the statisticians calculated that about twenty-five per cent had died of direct burns from the bomb, about fifty per cent from other injuries, and about twenty per cent as a result of radiation effects.
Maybe it's a combination of causes".
We were also able to find a statistically significant difference in hospital mortality in studies reporting predominantly H1N1 patients when compared to those in which veno-venous ECMO was initiated for a combination of causes leading to ARDS.
It is important to note that the sports injury definition was based on activity codes, while the road traffic injury case definition was based on a combination of cause and location coding so the two categories are not mutually exclusive.
Finally, alligator cracks are a combination of fatigue causes and unstable asphalt bases.
The discordant results are probably based on a combination of methodological causes and content-related reasons.
Many islands have been gradually submerged through a combination of sinking, caused by geologic action, and flooding, caused by the melting of ice caps.
A cause can be a single variable or a combination of other cause variables, e.g. elevated cholesterol in combination with hypertension.
