Gastrointestinal colds are mostly caused by viral infections of the intestines leading to gastroenteritis and symptoms of upper respiratory infections. Typically, a fever may last two to three days, but this can vary from person to person. If the individual has a strong immune system, the duration of the fever may be shorter; however, in elderly people or infants, the duration may be extended. It is important to focus on active treatment, which includes drinking plenty of water, eating more vegetables, reducing time spent outdoors, actively using anti-cold medications and medications for treating intestinal infections. During this time, attention should be paid to maintaining a regular diet, with timely and measured meals, and reducing consumption of greasy, spicy, and irritating foods. (Specific medications should be used under the guidance of a physician.)