Yet Elar never gave him obvious cause for feeling the difference in years.

Researchers could find no obvious physical cause for these patients' lingering problems.

The most obvious cause of the recent turnaround is the fall in energy prices.

The most obvious cause for alarm is the Soviet economy.

History does not reveal an obvious cause of the low back pain.

"I see you have a rather obvious cause of death here."

No obvious cause is found in about 50% of cases.

Have you missed two periods, and there is no obvious cause?

He saw several doctors, who could find no obvious cause.

A fever without an obvious cause comes back more than once in 3 weeks.