Being in love makes a person feel a warm glow everywhere apart from their knees, perhaps hinting that there may be something in the popular saying that the object of a person’s affection makes them ‘weak at the knees’.

Sadness leaves our limbs feeling weak and we are extra-aware of activity in our chest – and heart.

Depression also leaves us feeling weak, while disgust is felt in the throat and digestive system.

Basic emotions including anger and fear cause an increase in sensation in the upper chest area, which could be because we are subconsciously preparing for a fight.