The full form of USOH is Usual state of health

The usual conception of Health is a state of physical and mental well-being free from disease or other afflictions. If we become sick and fall below what’s accepted as “normal” health, we go to a physician that may intervene via prescribing drugs to ingest accompanied by some behavior modification.

Example:

A woman who has any of those problems nearly every day for more than two or three weeks is advised to see a gynecologist, especially if the symptoms are new and quite different from her usual state of health.