The phrase "a chronic source of" is correct and usable in written English.
It can be used to describe something that consistently causes a problem or issue over a long period of time.
Example: "The lack of funding has become a chronic source of frustration for the project team."
Alternatives: "a persistent cause of" or "a continual source of".
But he expressed concern that the South China Sea would be a chronic source of friction.
The issue of medicating horses has been a chronic source of controversy for the horse-racing industry.
"It will be a chronic source of emissions that will last hundreds of years".
Officials in a number of states have called Talx a chronic source of error and delay.
Until recent years, the sugar was a chronic source of production problems for many winemakers -- it contributes to high levels of alcohol in fermentation, which can kill the yeast prematurely and produce acetic acid, turning wine to vinegar.
Until recently, the interchange was a chronic source of congestion for motorists and for the many distribution companies, even though they generally liked Carteret's proximity to New York and to the New Jersey port area and Newark Liberty International Airport.
The persistence of a single clone of M. avium (up to 18 months) in hospital (von Reyn et al. 1994) and distributed municipal drinking water (Hilborn et al. 2006) as a potential chronic source of human exposure is a major challenge.
Fuelwood harvesting cannot be ignored as a major and chronic source of forest degradation in highly fragmented and densely populated landscapes and conciliating biodiversity conservation with poverty amelioration is an urgent task.
Moreover, it has been proposed that blood-borne Aβ peptides could represent a substantial and chronic source of soluble, exogenous Aβ peptides [ 11].
The research suggests, she said, that doctors (and psychotherapists) might be able to use this knowledge to help patients block the fearful emotions they experience when recalling a traumatic event, converting chronic sources of debilitating anxiety into benign trips down memory lane.
