The phrase "sudden bout" refers to a sudden occurrence or episode of something, usually a short-lived and intense experience or feeling. Full definition
If you notice a change in their stool, sudden bouts of vomiting, or they develop a rash, stop feeding them that particular food and speak with your pediatrician immediately. (omaby.com)
It is not uncommon to feel extreme depression or anxiety in sudden bouts. (doctor-info.website)
People with chronic pancreatitis who continue to consume large amounts of alcohol may develop sudden bouts of severe abdominal pain. (dietgrail.com)