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The causes ofchronic fatigue syndrome(ME/CFS) are unclear. These factors may include: Not everyone with chronic fatigue syndrome has all of these factors. Research is trying to identify the genes that could be responsible. © Verywell, 2018 Some has focused on the genes involved in thehypothalamic-pituitary-adrenal(HPA) axisand the sympathetic nervous system. The HPA axis controls your sleep, response to stress, and depression. An infectious trigger is also suspected because many ME/CFS cases start suddenly after a flu-like condition....

Chronic lymphocytic leukemia(CLL) starts in the bone marrows white blood cells, specifically thelymphocytes. While the exact cause of CLL isnt known, experts do know that genes play a role. This article will discuss the causes and risk factors of chronic lymphocytic leukemia. Morsa Images / Getty Images When something goes wrong in the production of these white blood cells, cancer can occur. In the case of CLL, genetic mutations cause the out-of-control production of lymphocytes....

Diarrhea is a common problem that can come on suddenly or be a chronic complaint. Some possible causes ofdiarrheainclude food poisoning, infections, food allergies or intolerances, and medication. Food Poisoning Food poisoningoccurs when you eat food that is contaminated with bacteria. Illustration by Brianna Gilmartin, Verywell The bacteria build up toxins in the food that make you sick. Examples of viruses that can cause stomach flu arerotavirusandnorovirus. Gastroenteritis also can be brought on by a bacterium or a parasite....

Endometrial canceraffects the lining of the uterus, theendometrium, and is the most common form of uterine cancer. Genetics A gene mutation or genetic disorder may increase your risk of endometrial cancer. The gene mutation associated with HNPCC is passed from parents to children. Illustration by Joshua Seong, Verywell Get our printable guide for your next doctor’s appointment to help you ask the right questions. Estrogen is a naturally occurring hormone made in the ovaries, along with the hormone progesterone....

Food allergies should not be confused with allergy-like reactions to food (known asfood intoleranceor non-allergic food hypersensitivity). Examples includelactose intoleranceandsulfite allergy. Under normal circumstances, your immune system will defend against infectious organisms and other invaders. ​Laura Porter / Verywell It does so by recognizing substances on the surface of a cell known asantigens. These antibodies will bind the antigen and trigger aninflammatory responseto help neutralize the invader. With an allergy, the immune system will overreact to an otherwise harmless antigen, referred to as anallergen....

The term “gallbladder disease” describes any health problem that affects the gallbladder. They can lodge in the biliary ducts. What Does the Gallbladder Do? © Verywell, 2018 Your gallbladder stores bilea fluid made by the liver that’s necessary for digesting and absorbing fat and vitamins. The vast majority of people with gallstones in the United States have cholesterol stones. Pigment gallstonesmay form if there is too much bilirubin. Get our printable guide for your next doctor’s appointment to help you ask the right questions....

Verywell / Zorica Lakonic The causes and risk factors for non-celiacgluten sensitivityare unclear and are being researched. Unlikeceliac disease, it doesn’t have the typical markers or intestine damage used to diagnose that autoimmune disorder. And unlike wheat allergy, it doesn’t have the markers of an allergic disorder. Verywell / Zorica Lakonic Some researchers theorize that the problem in those told they have gluten sensitivity may not be gluten at all....

Graves diseaseis the most common cause of an overactive thyroid gland (hyperthyroidism). The condition is thought to be sparked by genetic, environmental, and other factors. Learn more about the causes and risk factors of Graves disease. eclipse_images / Getty Images When a person has Graves disease, the immune system produces anabnormal antibodyknown as thyroid-stimulatingimmunoglobulin(TSI). TSI stimulates the thyroid gland by mimicking thethyroid-stimulating hormone(TSH) produced in thepituitary gland. Thethyroid glandthen produces excess thyroid hormone, leading to hyperthyroidism....

Head licecan cause a high level of anxiety. Head lice infestation affects millions of children and adults each year, in every socioeconomic condition. While undesirable, lice don’t spread any diseases. © Verywell, 2018 They can be found on the hair of the head,eyebrows, and eyelashes. They are especially likely to be found behind the ears and at the neckline. While lice are a nuisance, they do not spread disease. Get our printable guide for your next doctor’s appointment to help you ask the right questions....

Common Causes Headaches are unpleasant experiences, so treating them promptly is key. But to get to effectively treat your headaches, you must understand them. Other variables linked to migraine development include structural brain changes and serotonin release. Bailey Mariner / Verywell This sensitization is thought to play a pivotal role in the transformation from episodic tochronic tension-bang out headache. Cluster Headache Cluster headaches are uncommon and often begin without warning....

Mosthemangioblastomasoccur for no known reason and are discovered only after symptoms develop. Fortunately, these benign tumors can usually be cured with surgery. In some cases, hemangioblastomas grow as a result of a genetic condition calledvon Hippel-Lindau(VHL) syndrome. Verywell / Jessica Olah In this article, you’ll learn more about genetic risk factors and other possible causes of hemangioblastomas. Verywell / Jessica Olah Common Causes The cause of most hemangioblastomas is a mystery....

Several things can causehepatitis, including microbes, harmful substances, and medical conditions. alcohol or drugs) and autoimmune diseases. Toxic Hepatitis Toxic hepatitis is when substances damage the liver and cause it to swell. The primary drivers behind toxic hepatitis are alcohol, toxic chemicals, and certain medications. Approximately 70% of people with autoimmune hepatitis are women, typically between the ages of 15 and 40. Frequently Asked Questions Treatment varies depending on the bang out of hepatitis....

Hyperkalemiais the medical term for blood potassium levels that are too high. Potassium is a chemical element that is essential for life. Before the days ofdialysis, hyperkalemia was a frequent cause of death in people with kidney disease. © Verywell, 2018 They include: What Are Potassium-Sparing Diuretics? They are commonly used to treat high blood pressure. This is because insulin helps move potassium from the blood into the cells. Genetics There are two rare hereditary disorders that can cause hyperkalemia....