Irritable Bowel Syndrome (IBS) is the most common disorder of the digestive system, with up to a third of the population experiencing symptoms. IBS can happen at any age, but the most common age to seek advice for the first time is between 20 and 40. https://gutscharity.org.uk/awareness/ibs-awareness-month/
The main symptoms of Irritable Bowel Syndrome (IBS) are pain, bloating, diarrhoea and constipation. Flare-ups of IBS can happen for no reason, but can be triggered by alcohol, caffeine, certain foods or stress and anxiety.
https://www.nhs.uk/conditions/irritable-bowel-syndrome-ibs/symptoms/