The phrase "a more common reason" is correct and usable in written English.
You can use it when discussing the frequency or prevalence of a particular reason in comparison to others.
Example: "While there are several reasons for the delay, a more common reason is the lack of resources."
Alternatives: "a more frequent reason" or "a more prevalent reason".
It's more likely that you're losing your hair for a more common reason — another medication, a thyroid condition or other illness, or age-related changes in hormone levels.
Only pregnancy is a more common reason than infertility for a woman to visit her doctor; yet a recent poll found that almost all family doctors thought patients who needed fertility treatment should pay for it themselves (not so those with varicose veins, for example).
But neglect is a more common reason that sites linger past their prime.
Infection or inflammation was a more common reason for performing enucleation or secondary orbital implantation instead of evisceration.
Our analysis showed that participants believed sexual dissatisfaction to be a more common reason for men to engage in CP than women.
The desire for independence is a more common reason for being in a LAT union in Germany (23%) and France (17%) than elsewhere.
But a much more common reason that wealth managers give for enjoying their job is that it is not just intellectually challenging, but emotionally fulfilling.
By Mike Pflanz BURTINLE, Somalia, 28 March 2011 – At first, the class of teenagers is a little shy when asked whether menstruation or early marriage is the more common reason why girls drop out of school.
Gender equality classes help Somali teenage girls stay in school BURTINLE, Somalia, 28 March 2011 – At first, the class of teenagers is a little shy when asked whether menstruation or early marriage is the more common reason why girls drop out of school.
The alternative, but more common reason is that people thought those Pages' posts were spammy.
Another and, possibly, more common reason is likely to be the genuinely high noise in early microarray experiments; I suspect that, in this case, technology progresses faster than many researchers realize.
