A man has been found dead inside the home of former Health Services Union boss Kathy Jackson.

NSW Police said officers were called to the Wombarra home, just north of Wollongong, at 11.30am, and found a 40-year-old man.

A police spokesman said it is believed the man had a medical episode and the death is not being treated as suspicious.

The man is understood to be a friend of Ms Jackson and her partner, Fair Work Commission vice-president Michael Lawler.