Here are some examples:
* Hypoglycemia: Low blood sugar
* Hypothermia: Abnormally low body temperature
* Hypotension: Low blood pressure
* Hypoactive: Less active than normal
* Hypothyroidism: Underactive thyroid gland
The meaning of "hypo" can vary slightly depending on the context, but it generally implies a deficiency or a state that is below the normal or expected level.