Sun is the Karak or significator for father, government and its bureaucracy, the higher hierarchy of where you work, stomach, and digestion. It also represents the eyesight, especially of the right eye. Fame or infamy is also under its domain. If you feel that you are facing issues pertaining to what has been mentioned above then the chances are that Sun is placed Neech or in debilitation in your horoscope. The same results will accrue if the Sun is placed in close proximity with Rahu. Sun is a cruel planet but never malignant.
The true role of the Sun can only be delineated by the study of the horoscope. This must be kept in mind. It will be erroneous to study its role through symptoms alone.