Gastrointestinal flu is one of the most common types of flu, mostly caused by viral infections of the respiratory tract that lead to varying degrees of fever, nasal congestion, runny nose, itchy throat, cough, and other symptoms. Simultaneously, clinical symptoms such as bloating, diarrhea, loss of appetite, and abdominal pain can also occur. For such patients, we can generally adopt corresponding antiviral and heat-clearing and detoxifying treatments. If the patient experiences obvious symptoms such as abdominal pain, we can use a hot water bottle to apply to the stomach area, which can help relieve pain locally and also alleviate associated symptoms such as loss of appetite due to gastrointestinal bloating. Thus, for some patients with gastrointestinal flu, applying heat to the stomach area can be beneficial. Clinically, the treatment can be appropriately selected according to the patient's condition, but care must be taken to avoid burns during the heat application.