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= Esophagitis =

Abstract
Esophagitis (or oesophagitis) is an inflammation of the esophagus. The prefix esophag/o refers to the esophagus and the suffix -itis means inflammation. The esophagus is part of the digestive system, specifically the gastroinetestinal tract. It is a muscular tube where food passes through from your mouth to your stomach. Esophagitis is a disease that can be painful and can make swallowing difficult. However, esophagitis can be asymptomatic. Esophagitis can be caused by infection, irritation, and/or inflammation of the lining of the esophagus. The most common cause of esophagitis is gastroesophageal reflux disease (GERD). It, specifically, causes reflux esophagitis, but it is not the only cause or the only type. Esophagitis is most often seen in adults and is considered uncommon in childhood.

Mechanism
The esophagus is a muscular tube made of both voluntary and involuntary muscles. It is responsible for peristalsis of food. It is about 8 inches long and passes through the diaphragm before entering the stomach. The esophagus is made up of four different layers: serosa,  muscularis externa,  submucosa, and the mucosa. The mucosa, which is the inner most layer and lining of the esophagus, is composed of stratified squamous epithelium, lamina propria, and muscularis mucosae. Esophagitis occurs when there is an infection or irritation to the layers of the esophagus. Infection can be caused by bacteria, viruses, fungi, or diseases that weaken the immune system. Irritation can be caused by GERD, vomiting, surgery, medications, hernias, and radiation injury. Inflammation can cause the esophagus to narrow, which makes swallowing food difficult and may result in food bolus impaction. Irritation from the backflow of acid can cause the feeling of burning in the chest and can result in the flow of acid into the throat causing acid reflux or regurgitation. If irritation, infection, and/or inflammation to the esophagus continues, it is likely that the symptoms and signs will increase.

Symptoms
The signs and symptoms for esophagitis include: A doctor should be consulted if the signs and/or symptoms do not subside after a few days, are accompanied with flu-like symptoms, do not lessen after treating with over-the counter antacids, and/or make eating food difficult.
 * Heartburn feels like the inside of your chest is burning. It is a symptom of acid reflux or GERD.
 * Nausea is the feeling of being sick, specifically with the urge to vomit.
 * Swallowing is painful and difficult to pass food through your throat into your esophagus.
 * Vomiting, also known as emesis, is the release of the contents of the stomach through the mouth or nose.
 * Abdominal pain is when pain is felt in the abdomen.
 * Food bolus impaction is an obstruction of the esophagus by swallowed food.
 * Acid regurgitation is the backflow of acid from the stomach to the mouth.
 * Chest pain is pain felt between the neck and upper abdomen. There are many causes and the pain can range.
 * Cough is a reflex to clear the throat of irritants or mucus.

Diagnosis
A gastroenterologist is a medical professional that can diagnose esophagitis. To diagnose esophagitis, the doctor will interview the patient regarding their signs and symptoms. If the doctor suspects esophagitis, tests can be ordered. Esophagitis can be diagnosed by an upper endoscopy, biopsy, upper GI series (or barium swallow), and laboratory tests.

An upper endoscopy is a procedure to look at the esophagus by using an endoscope. While looking at the esophagus, the doctor is able to take a small biopsy. The biopsy can be used to confirm inflammation of the esophagus.

An upper GI series uses a barium contrast, fluoroscopy, and an X-ray. During a barium X-ray, a solution with barium or pill is taken before getting an X-ray. The barium makes the organs more visible and can detect if there is any narrowing, inflammation, or other abnormalities that can be causing the disease. The upper GI series can be used to find the cause of GI symptoms. An esophagram is if only the throat and esophagus are looked at.

Laboratory tests can be done on biopsies removed from the esophagus and can help determine the cause of the esophagitis. Laboratory tests can help diagnose a fungal, viral, or bacterial infection. Scanning for blood white blood cells can help diagnose eosinophil esophagitis.

Some lifestyle indicators for this disease include: stress, unhealthy eating, smoking, drinking, family history, allergies, and an immunodeficiency. It is important for the doctor to review the patient's medical history before diagnosing with esophagitis. Specific subtypes and other causes should be taken into account when making the final diagnosis.

Subtypes of Esophagitis
Reflux esophagitis

A backflow of stomach acids into the esophagus that causes irritation, chronic inflammation, and tissue damage in the esophagus.

Infectious esophagitis

Esophagitis that happens due to a viral, fungal, parasitic or bacterial infection. More likely to happen to people who have an immunodeficiency. Types include:

Fungal
 * Candida (Esophageal candidiasis)

Viral Drug-induced esophagitis
 * Herpes simplex (Herpes esophagitis)
 * Cytomegalovirus

Damage to the esophagus due to medications. If the esophagus is not coated or if the medicine is not taken with enough liquid, it can damage the tissues.

Eosinophil esophagitis

This esophagitis is caused by a high concentration of eosinophils in the esophagus. The presence of eosinophils in the esophagus may be due to an allergen or acid reflux. This esophagitis can be triggered by allergies to food or to inhaled allergens. This type is still poorly understood.

Lymphocytic esophagitis

Lymphocytic esophagitis is when there is an increased amount of lymphocytes in the lining of the esophagus. It is a rare condition. It could be connected to eosinophilic esophagitis.

Grading of severity
The severity of reflux esophagitis is commonly classified into four grades according to the Los Angeles Classification:

Causes and Prevention
Causes

Esophagitis cannot be spread. It can develop due to many causes. GERD is the most common cause of esophagitis because of the backflow of acid from the stomach, which can irritate the lining of the esophagus.

Other causes include:
 * Medicines- Can cause esophageal damage that can lead to esophageal ulcers
 * Nonsteroidal anti-inflammatory drugs (NSAIDS)-aspirin, naproxen sodium, and ibuprofen. Known to irritate the GI tract.
 * Antibiotics- doxycycline and tetracycline
 * Quinidine
 * Biphosphonates- used to treat osteoporosis
 * Steroids
 * Potassium chloride

Prevention
 * Chemical injury by alkaline or acid solutions
 * Physical injury resulting from nasogastric tubes.
 * Alcohol abuse- Can wear down the lining of the esophagus.
 * Crohn's disease – a type of IBD and an autoimmune disease that can cause esophagitis if it attacks the esophagus.
 * Stress- Can cause higher levels of acid reflux
 * Radiation therapy-Can affect the immune system.
 * Allergies (food, inhalants)- Allergies can stimulate eosinophilic esophagitis.
 * Infection-People with an immunodeficiencies have a higher chance of developing esophagitis.
 * Vitamins and supplements-iron, Vitamin C, and potassium- Supplements and minerals can be hard on the GI tract.
 * Vomiting- Acid can irritate esophagus.
 * Hernias-A hernia can poke through the diaphragm muscle and can inhibit the stomach acid and food from draining quickly.
 * Surgery
 * Surgery

Since there can be many causes underlying esophagitis, it is important to try to find the cause to help to prevent esophagitis. To prevent reflux esophagitis, avoid acidic foods, caffeine, eating before going to bed, alcohol, fatty meals, and smoking. To prevent drug-induced esophagitis, drink plenty of liquids when taking medicines, take an alternative drug, and do not take medicines while lying down, before sleeping, or too many at one time. Esophagitis is more prevalent in adults and does not discriminate.

Treatment and Prognosis
Treatments for esophagitis include medications to block acid production, to manage pain, and to reduce inflammation. Other treatments include antibiotics and intravenous nutrition.

o treat reflux esophagitis, over the counter antacids, medications that reduce acid production (H-2 receptor blockers), and proton pump inhibitors are recommended to help block acid production and to let the esophagus heal. Some prescription medications to treat reflux esophagitis include higher dose H-2 receptor blockers, proton pump inhibitors, and prokinetics, which help with the emptying of the stomach.

To treat eosinophilic eosophagitis, avoiding any allergens that may be stimulating the eosinophils is recommended. As for medications, proton pump inhibitors and steroids can be prescribed. Steroids that are used to treat asthma can be swallowed to treat eosinophil esophagitis due to nonfood allergens. The removal of food allergens from the diet is included to help treat eosinophilic esophagitis.

For infections esophagitis, a medicine is prescribed based on what type of infection is causing the esophagitis. These medicines are prescribed to treat bacterial, fungal, viral, and/or parasitic infections.

An endoscopy can be used to remove ill fragments. Surgery can be done to remove the damaged part of the esophagus. For reflux esophagitis, a fundooplication can be done to help strengthen the lower esophageal sphincter from allowing backflow of the stomach into the esophagus. As for patient that have a narrowing esophagus, a gastroenterologist can perform a procedure to dilate the esophagus.

Some home remedies and lifestyle changes to help with esophagitis include losing weight, stop smoking, lowering stress, avoid sleeping/lying down after eating, raise your head while laying down, taking medicines correctly, avoiding certain medications, and avoiding foods that cause the reflux that might be causing the esophagitis.

If the disease remains untreated, it can cause scarring and discomfort in the esophagus. If the irritation is not allowed to heal, esophagitis can result in esophageal ulcers. Esophagitis can develop into Barrett's esophagus and can increase the risk of esophageal cancer.

The prognosis for a person with esophagitis depends on the underlying causes and conditions. If a patient has a more serious underlying cause such as a digestive system or immune system issue, it may be more difficult to treat. Normally, the prognosis would be good with no serious illnesses. If there are more causes than one, the prognosis could move to fair.

Recent Research
In 2015, a treatment for reflux esophagitis was introduced. It involves a small invasive surgery to place a ring of magnetic titanium beads near the lower esophageal sphincter. It is called a magnetic sphincter augmentation device or MSAD. It was made to prevent GERD by keeping the stomach acid out of the esophagus. Before the implantation of the device, the patients in this study were taking proton pump inhibitors. The pilot study for this device resulted in a treatment that "preserves gastric anatomy" and results in "less severe side effects than traditional antireflux surgery." The patient's that had these devices implanted were given a questionnaire for their GERD Health Related Quality of Life (GERD-HRQL) before implantation. There scores improved after the five years and more than 80% discontinued their proton pump inhibitors. The normalization of esophageal pH was achieved by 70% of the patients in the study. At the end of the study, there were "no reports of death, device erosions, device migrations, device malfunctions, or late-occurring device complications."

The study of esophagitis has focused on reflux esophagitis over the years. However, recently, the study of different subtypes has emerged. Researchers have started to study other causes besides acid reflux. Eosinophilic esophagitis and infectious esophagitis are subtypes that target the lining of the esophagus via infection or immune-mediated inflammatory diseases. Other causes of esophagitis are being studied such as how Crohn's disease, caustic injury, chemotherapy, and radiotherapy can have an effect on the esophagus. It is important to realize that not all upper gastrointestinal tract symptoms are due to gastric reflux and to look at the patient's clinical history before diagnosing and treating the patient. It is important to note that there can be more than one underlying cause to esophagitis.