The phrase "severe cases" refers to situations or conditions that are particularly bad, extreme, or intense. It can be used in a medical context to describe patients with critical illnesses or injuries who require immediate and aggressive treatment. In a broader sense, it could also refer to any situation where the consequences of an action or event have reached their worst possible outcome, such as severe weather conditions causing widespread damage or destruction. The phrase is often used in legal contexts when discussing criminal offenses that are considered especially heinous or egregious and may result in more severe penalties or punishment.