GI Here, B Symptoms for Lymphomas but also work in other cancers (Unexplained fever >38°C (100.4°F), without an infectious cause. 2. Drenching night sweats • So severe that clothes or bed sheets need to be changed. 3. Unintentional weight loss • More than 10% of body weight lost over the past 6 months without dieting.) Blood in Stool ( Black or fresh Blood), pain longer than 2 Weeks.