It is common for the symptoms of IBS to fluctuate over time - there are good times and bad times.
IBS symptoms can vary greatly between individuals and they might vary over time. These include:
Excessive flatulence where passage of flatus/gas/wind is greater than usual.
Fatigue may also occur because of abdominal symptoms.
If you suspect you have IBS or regularly experience unacceptable gut symptoms please see your doctor or healthcare provider