Here are some examples:
* Hypoglycemia: Low blood sugar.
* Hypothermia: Abnormally low body temperature.
* Hyponatremia: Low sodium levels in the blood.
* Hypothyroidism: Underactive thyroid gland.
* Hypotension: Low blood pressure.
It's important to note that "hypo" can also be used in other contexts, such as in the word "hypocrisy," which refers to the practice of claiming to have moral standards or beliefs but behaving in a way that contradicts them.