The phrase "a first symptom of" is correct and usable in written English.
It can be used when discussing the initial signs or indicators of a condition, disease, or situation.
Example: "A first symptom of the flu is often a sudden fever."
Alternatives: "an initial sign of" or "a preliminary indication of".
To report a case of acute abdomen due to rupture of ovarian endometrial cysts, manifested as a first symptom of acute leukemia.
For example, we know that mild anaemia as a first symptom of colorectal cancer has a higher mortality than severe anaemia (Stapley et al, 2006), the implication being that 'softer' symptoms may go undetected for longer.
[ 5, 6] Patients will often share with their doctor what they heard from their colleagues or family, or what they read on the internet, for example that a prolonged cough may be a first symptom of lung cancer, or that fatigue is a sign of leukaemia.
That left Britain without defences against a second symptom of misrule, an "epidemic of bad law".
A second symptom of GE covariance in this connection is an overly large discrepancy between the phenotypic MZ and the DZ correlation (e.g., as mentioned above,.345 vs..054; but see Eaves 1988, for a genetic explanation).
Duration of symptoms, performance status, presence and duration of fits as a first symptom, and degree of neurological impairment at presentation have all been recognised as factors which influence prognosis (Cohaden et al, 1985; MRC Working Party, 1990; Hutton et al, 1992).
A frequent first symptom of multiple sclerosis is sudden onset of loss of central vision in one eye caused by optic neuritis.
In conclusion, in PSP patients, depression can represent a first symptom before an overt onset of disease.
He presents as relaxed and detached but in a manner hinting at the first symptom of a dangerous irrationality.
Mononeuropathy of a cranial nerve may sometimes be the first symptom of an intracranial or skull base cancer.
Emergency services should be called as a long grand mal seizure may be life threatening, and may be the first symptom of a severe neurological disorder if the patient does not have epilepsy.[18].[18]
