Grief reaction, the way someone copes with a loss, causes include anger, sadness, anxiety, guilt, and more. Fibromyalgia can affect various body systems, including the digestive system. Chronic fatigue syndrome is a condition that causes extreme tiredness that doesn't get better with rest. Anorexia nervosa is a serious psychological and eating disorder. Mesenteric lymphadenitis is an inflammation of abdominal lymph nodes causing pain, diarrhea, fever, and more. Our website services, content, and products are for informational purposes only. The links below will provide you with more detailed information on these medical conditions from the WebMD Symptom Checker and help provide a better understanding of causes and treatment of these related conditions. Bulimia is an eating disorder that involves binging on large quantities of food then purging it by vomiting. A doctor may examine a person’s abdomen by feeling with their hand for any unusual bloating, lumps, or tenderness. Acute kidney failure is sudden and can cause swelling, frequent dark urination, fatigue, nausea and more. How do you treat fatigue and loss of appetite? Other methods used to treat fatigue or loss of appetite include: Counseling or participating in a support group may also help reduce depression and anxiety-related causes of fatigue and loss of appetite. Depression is a painful sadness that interferes with a child's schoolwork, family life, and social activities. A variety of lifestyle habits and conditions can cause abdominal pain and loss of appetite. It is vital for people to find out the reason for their loss of appetite, as leaving it untreated can be serious. People with sleep apnea stop and restart breathing multiple times while sleeping. Inflammatory bowel disease causes swelling and symptoms such as cramping, chronic diarrhea, and bleeding. See additional information. A drug allergy is an allergic reaction to a medication and can cause a rapid heartbeat and difficulty breathing. Some people in the later stages of serious illnesses may experience cachexia. Depression is a painful sadness that interferes with daily life and includes hopelessness, anxiety, and more. Budd-Chiari syndrome is a rare liver condition, symptoms include pain, swelling, and vomiting blood. Cystic fibrosis is an inherited disease that causes the body to produce abnormally thick and sticky mucus. Multiple sclerosis is a disease of the nervous system causing difficulties with balance, speech, and movement. Why You Should Rethink That Drink Before Dinner, New Clues Why Mosquitoes Find You Irresistible, Popular Heartburn Meds Can Have Health Risks. A person’s appetite usually returns when they start to recover. Some conditions that can cause continuous pain include: Other causes of fatigue and loss of appetite include: You may also feel more tired than usual when your body is fighting off infection. Malnutrition occurs when the body isn't getting enough nutrients; sometimes the condition is life-threatening. It is a good idea to take regular drinks of water throughout the day. Having anxiety about food isn't uncommon. Cat scratch disease is a bacterial infection caused by a cat scratch or bite. Common viral or bacterial infections, such as flu or gastroenteritis, are often to blame for appetite loss. ©2005-2015 WebMD, LLC. Intestinal obstruction is when the intestine is blocked and causes pain, swelling, nausea, diarrhea, and more. Dehydration, or not getting enough fluid, causes dry and sticky mouth, tearless crying, and more in children. A tick-related illness may cause a rash that expands out from the site of the bite, fever, chills, and more. Hepatitis B is an inflammation of the liver that may cause yellowing of the skin and eyes, tiredness, and more. Myelodysplastic syndromes are diseases that affect the bone marrow and blood, causing anemia and tiredness. These symptoms could indicate a heart attack or stroke. It is important never to stop taking a medication unless a doctor advises it. Sign up to receive WebMD's award-winning content delivered to your inbox. tiredness ; loss of appetite ; a change in your toilet habits ; an increase in illnesses or infections; Other common causes of unexpected weight loss. © 2005-2020 Healthline Media a Red Ventures Company. See if the Overeaters Anonymous food plan is right for you, and get tips on creating one. Atrial fibrillation is a heart condition that causes heart palpitations, confusion, dizziness and more. Read on to see what conditions may cause these symptoms. This is different to the eating disorder anorexia nervosa, which is a mental health issue. WebMD does not provide medical advice, diagnosis or treatment. In most cases, appetite loss and tiredness are the result of a minor illness or a change to a person’s diet or sleep routine. Dehydration, or not getting enough fluid, causes dry and sticky mouth, tearless crying, and more in children. Myelodysplastic syndromes are diseases that affect the bone marrow and blood, causing anemia and tiredness. Osteomyelitis (bone infection) Osteomyelitis is an infection of a bone that causes pain, swelling, and redness. People with eating disorders have extreme and dangerous eating habits. Loss of appetite and nausea can occur together when you’ve eaten something that doesn’t agree with your stomach. There are 140 conditions associated with decreased appetite, fatigue, nausea or vomiting and weight loss (unintentional). Celiac disease, which is an intestinal reaction to gluten, can cause gas, diarrhea, bloating, and weight loss. Tuberculosis usually infects the lungs, causing a bad cough with blood, chest pain, fever, chills, and fatigue. A drug overdose can be fatal and causes sleepiness, confusion, coma, vomiting, and other symptoms. Hepatitis A is an inflammation of the liver. How can I prevent or treat fatigue and loss of appetite at home? Below are some home remedies that may help alleviate tiredness and improve a person’s appetite. For example, they may recommend: Ask your doctor for more information about your specific diagnosis and treatment options.