The world is seeing rising rates of anger, stress and anxiety, a new survey has found.
The annual Gallup Global Emotions Report involved 150,000 people, a third of which reported feeling stressed.
People from more than 150 countries were interviewed in the poll, with at least 20 per cent claiming they felt sad or angry.
The most downbeat country was Chad, in Africa, followed by its neighbour Niger, while the most positive state was Paraguay, in South America.
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Pollsters asked people about their day before the interview, with questions including 'were you treated with respect?' and 'did you smile or laugh a lot yesterday?'.
Roughly 71 per cent of the interviewees claimed they experienced a considerable amount of enjoyment the day before the survey.
Some 39 per cent said they had been worried, while 35 per cent reported feeling stressed.
The top five countries with the most negative experiences were: Chad, Niger, Sierra Leone, Iraq and Iran.
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The states with the most positive experiences were: Paraguay, Panama, Guatemala, Mexico and El Salvador.
It is believed the survey's results reflect the focus that many Latin American countries have on keeping a positive mindset.
African countries top the list of the most negative countries, in part because of basic struggles such as affording food, dealing with poor infrastructure and even coping with war.
The survey also found that Greeks are the most stressed people in the world, with 59 per cent claiming they felt the emotion the day before being interviewed.
