The phrase "a source of unrest" is correct and usable in written English.
It can be used to describe something that causes anxiety, disturbance, or conflict in a particular situation or environment.
Example: "The ongoing political turmoil has become a source of unrest among the citizens."
Alternatives: "a cause of turmoil" or "a trigger for conflict".
They are viewed as a source of unrest that could threaten the Communist Party's power.
Over the past five years, it has become a standard Iranian position that the Anglo-US alliance is a source of unrest in Sistan-Baluchistan and other provinces.
Those two issues continued to be a source of unrest in the 1980s and '90s and into the 21st century, evoking many protests and demonstrations.
Academics are concerned that China and its conservative backers in Hong Kong are trying to exert more control over universities and schools to rein in criticism and silence a source of unrest.
But the opposition says the event was fabricated to create a pretext to crack down on dissidents in the city, the site of a violent uprising seven years ago and still a source of unrest.
The pro-government camp itself is also potentially a source of unrest, divided as it is among a variety of personalities, ambitions and different opinions on how to tackle Ukraine's manifold problems.
Corruption: The appropriation of villagers' land by corrupt officials, in collusion with property developers, is a source of growing unrest.
Officials pledged to increase subsidies for China's northeastern region, where old-line government-run industries have withered and unemployed workers are a source of social unrest.
Ethnic tensions have long been a source of social unrest in Inner Mongolia, a resource-rich region bordering Mongolia and Russia.
Legislative elections, which had originally been scheduled for 2011, were repeatedly delayed and were a source of political unrest in the country.
Mr. Zhu acknowledged a widening gap between rich and poor, which has become a source of popular unrest, but he said it was unavoidable during China's transition from a planned economy.
