The phrase "a sign of underlying" is correct and usable in written English.
It can be used when indicating that something is indicative of deeper or hidden issues or conditions.
Example: "The sudden increase in stress levels among employees is a sign of underlying problems within the organization."
Alternatives: "an indication of deeper" or "a symptom of hidden".
Further, G.M.'s reliance on ever-accelerating incentive deals, like interest-free financing, is not improving its profitability and is seen as a sign of underlying sickness.
Just as a rosy complexion can be a sign of health or of a fever, deflation can be a sign of underlying economic strength or weakness.
Bradley said the inflated graduation rates are a sign of underlying trouble at neighborhood high schools — a problem the city has to confront.
Even if temporary setbacks were to blame, the economy's inability to take hits without backsliding is a sign of underlying fragility.
Fed officials have hinted that they are open to lowering rates to help avert a recession, but a sign of underlying strength — like a big gain in jobs — could persuade them to take a less aggressive stance.
The fact that South Africa has an aggressive free press and outspoken opposition parties and law-enforcement agencies that provide the critics with so much meat is a sign of underlying ethical health, he said.
On the other hand, a reduced LV/RV ratio could be a warning sign of underlying disease.
The jejunum of all patients was carefully checked for any signs of underlying pathology and inflammation during operation and before the start of the IR procedure.
The present findings showing weight loss occurring in individuals who receive a cancer diagnosis highlight the importance of future research to clarify whether weight loss is a deliberate health promoting activity or is a more ominous sign of underlying health state.
In a sign of the underlying trends in the economy, business visits were up by 10% over the past year, exceeding the 8% growth in holiday travel.
Frequently, pes cavus may be a sign of an underlying neurological disorder, including spinal cord and peripheral nerve pathologies, such us spino-cerebellar ataxia and hereditary peripheral neuropathies.
