The range of values for low fever is between 37.4 and 38°C. Low fever can cause systemic symptoms, or gastrointestinal reactions. The most common symptoms are nausea, vomiting, or weakness, which are very common. The first one, is caused by a cold or fever. The second one may be caused by pneumonia, which is a series of systemic symptoms caused by the conflict between inflammation and the organism. Low fever, nausea, vomiting, or weakness is a legitimate response by the body’s immune system. If a low fever develops, this condition should be treated aggressively. Replenish energy and try to rest. Also protect your stomach and watch your diet. If it is difficult to feel well, take antipyretics, as long as the fever is reduced, then these symptoms can be relieved and can disappear.