The phrase "a causal connection between" is correct and usable in written English.
It can be used when discussing the relationship or link between two events or variables, particularly in scientific or analytical contexts.
Example: "The study aimed to establish a causal connection between diet and health outcomes in the population."
Alternatives: "a cause-and-effect relationship between" or "a link between causes and effects."
But the idea that there's a causal connection between things like sexual permissiveness and social harm is obviously fatuous.
The city, which argued that the residents had not been able to show a causal connection between the landfill and the cancer cases, said it would appeal.
Meanwhile, off stage, the Greek economy collapses, and Sinclair understandably can't resist making a causal connection between the "nation's bankruptcy" and its Olympic folly.
In the desperation that ensues – Sylvia Gellburg doesn't appear to have anything physically wrong with her – the possibility of a causal connection between the two events is raised.
But we still wonder to this day whether there was a causal connection between my husband's vigilance and the surgeon's collapse.
The article points out that there is insufficient data to prove a causal connection between cell phone use and resulting accidents and deaths.
But even though yawning and drowsiness occur together, no experiment has shown a causal connection between the two.
So far, much to Downing Street's relief, there has been a commendable (if surprising) reluctance to make a causal connection between Mr Blair's Iraq policy and the bombings.
They paid handsomely for a public-relations campaign that insistently denied any proof of a causal connection between smoking and cancer.
She did not draw a causal connection between the maintenance work and the derailment, or, for that matter, between the heat and the derailment, saying investigators had much more work ahead of them.
Colombian Health Minister, Alejandro Gaviria, said: "There is a causal connection between Zika, Guillain-Barre and the death of three Colombians, one in San Andres and another two in Turbo, Antioquia".
