Interestingly, the overlap doesn’t stop here. Feelings of depression, loneliness and low mood can all impact our energy levels and motivation, meaning we’re less likely to get out and meet up with people, or take some exercise – both of which are hugely beneficial not only physically, but mentally too.

So, there’s definitely a link between immune health and feelings, but how far can we really take this?

Short-term anxiety boosts immunity but chronic anxiety lowers it

Shubrook breaks it down: “It’s commonly accepted that when we are anxious, part of the body’s innate survival instinct is to go into fight, flight or freeze mode. As well as releasing chemicals such as adrenaline and cortisol, the body also “boosts” the immune system during this time. But the challenge comes when we struggle with negative emotions such as low mood, depression or anxiety over a longer period of time.

“These kinds of emotions increase the production of certain hormones which cause low-grade inflammation, as well as reducing the body’s production of protective killer cells. Collectively, this leads to weakened immunity.”

The good news is that the experts agree we’re talking about long-term, frequent exposure to negative emotions. Feeling cross with the person who stole your parking spot might not be advisable, but as a one-off, it won’t do you any harm.

Mental health and immunity: why low mood can make you more susceptible to illness