What Causes Loss of Appetite?

Loss of appetite refers to a diminished desire to eat—ranging from reduced interest in food to complete aversion or anorexia. Multiple factors can cause loss of appetite. Common symptoms associated with indigestion include the following: First, excessive fatigue. Overexertion often leads to loss of appetite. Due to high work-related stress, many individuals bear heavy physical and mental burdens, resulting in fatigue or psychological tension, which may trigger transient loss of appetite—a relatively mild condition.

Second is anorexia nervosa. Individuals who obsessively monitor their weight, fear weight gain, deliberately avoid eating, experience significant unintentional weight loss, and persistently refuse food may gradually develop loss of appetite—and, in severe cases, full-blown anorexia nervosa. Third, physiological changes during specific life stages—for example, early pregnancy, menstruation, or while taking oral contraceptives—can commonly cause temporary loss of appetite; symptoms typically resolve once this phase passes.

Fourth are pathological causes—for instance, gastrointestinal disorders such as gastritis, enteritis, or even malignancies, as well as hepatic diseases. These underlying medical conditions pose serious health risks. Persistent loss of appetite not only compromises overall health but also leads to malnutrition, thereby exacerbating disease progression. Therefore, when loss of appetite occurs, it is essential to actively identify its underlying cause and initiate appropriate, targeted treatment to prevent disease deterioration.