Sugar Bear -- Passes Out at Mama June's House ... Ambulance Called

Sugar Bear fainted at Mama June's house Sunday afternoon ... and EMTs were called to the scene to treat him during a scary incident.

Sources close to the family tell us Suge has been staying at Mama June's house for a few days -- and it's unclear if the couple were arguing when he took the header.

We're told Sugar Bear regained consciousness before the ambulance arrived ... and was able to walk outside and greet the EMTs before they ran a bank of tests.

Our sources say EMTs diagnosed the problem as high blood pressure.