Why loneliness is painful

Loneliness is a subjective individual experience. You can be surrounded by people yet feel lonely. If you feel lonely, you are lonely.

Loneliness can affect everybody, regardless of money, fame, power, beauty, social skills, a great personality.

Loneliness is part of your biology, just like hunger. Hunger make you pay attention to your physical needs; loneliness makes you pay attention to your social needs. So loneliness is an early warning system to ensure you stop behaviour that would isolate you.