How long has this been a problem?
Do you drink alcohol or have any medical problems?
How long does the nausea last every day?
Do you have any other problems (gas, stomach pain etc)
Do you take any medication?
Nausea is a very non-specific symptom and in itself is not a condition but reflects that there may something else to investigate.
Nausea can occur in a wide range of condition, in a young sexually active woman then we think of pregnancy first, while if the problem is short term and associated with vomiting or diarrhea then we think about stomach bugs.
A long term chronic problem with nausea may indicate an underlying abnormality of electrolytes, or a stomach problem such as gastritis or stomach ulcer. The abdomen may be a common cause of physical causes such as inflammation of pancreas, appendix or gall bladder. Other possibility is there can be a relationship with stimulation of the central nervous system such as with migraine or raised intracranial pressure. Non-physical causes such as stress and anxiety should also be considered too.
As you can see there are a wide number of problems that will need a full history, examination and blood tests to narrow down the possible diagnosis. A very simple cause of nausea is chronic dehydration, so just increasing the amount of fluid intake may help in some cases. Eating small bland meals or using ginger may help.
Certainly if the nausea has lasted all morning then you do need to see your family doctor for an assessment.