The phrase "a frequent reason for" is correct and usable in written English.
It can be used to indicate a common cause or explanation for a particular situation or outcome.
Example: "A frequent reason for project delays is poor communication among team members."
Alternatives: "a common cause of" or "a regular explanation for".
Weight gain is a frequent reason for discontinuing the contraceptive with depot-medroxyprogesterone acetate (DMPA).
Life sustaining treatment limitation is a frequent reason for ICU recourse.
Migraine headache represents a frequent reason for neurological evaluation in developmental age.
Conclusion: Septic shock is a frequent reason for hospitalization in ICU.
There is often a vicious circle here - a frequent reason for not adopting a new technology in chemistry is "there is no demand for it".
CDH, especially chronic migraine, is one of the most disabling headaches and a frequent reason for consultation in neurology departments, accounting for at least one-third of the visits to headache centers.
The prospect of returning to Poland in the foreseeable future is a frequent reason provided for staying in touch with homeland affairs and continuing to vote in Polish elections.
A frequent reason given by patients for not returning for review in Malawi is the cost of transport (Yu et al. 2007, Bedford et al. 2011).
Discontinuations accounted for only a small proportion of the treatment changes in the insulin cohort (8.2% overall); inadequate response became a more frequent reason for discontinuing therapy as the study progressed.
We also collapsed the 5 IMD quintiles to two groups (IMD1-3 and IMD 4 5), and found that reasons for non-implementation were similar, although patient death was a more frequent reason for non-implementation in the least deprived group (data not shown).
Inadequate response became a more frequent reason for discontinuing therapy as the study progressed (52.8% and 50.0% of discontinuations in the periods 0 to 3 months and >3 to 6 months, respectively; 71.4% of discontinuations during the period > 6 to 12 months).
