The stomach is an important hollow organ of the digestive system and is located in the upper left abdomen, below the diaphragm. Anatomically, the stomach connects the esophagus to the duodenum and, through it, to the intestines. The stomach’s main function is to store, break down, and mix ingested food with gastric juice. The stomach lining contains numerous glands that produce hydrochloric acid, enzymes such as pepsin, and protective mucus.
The stomach acid creates a highly acidic environment with a low pH value, which kills bacteria and aids digestion. During digestion, the chyme is mixed by peristaltic movements of the stomach’s muscle layer. The chyme is then passed in portions through the pylorus into the duodenum.
What exactly is the stomach?
It is a hollow organ made of muscle tissue that plays a role in the digestion of food. Its main function is to mix the ingested food with acidic gastric juice, thereby breaking it down. Only then does it pass the food in small batches to the small intestine for digestion. The video shows you how the digestive system works together:
The capacity of the human stomach depends on many factors. It is primarily determined by body weight, gender, and height. In addition, eating habits also have a major influence on its maximum capacity. On average, however, it holds 1.5 liters.
The Structure of the Stomach
The stomach is located in the upper left abdomen, directly beneath the diaphragm. It connects the duodenum to the esophagus and performs numerous other functions related to digestion.
The gallbladder and the liver are located directly to the right of the stomach. The spleen is situated on the opposite side. Finally, the large intestine and the small intestine are located below the stomach. The stomach therefore occupies a central position in the human digestive tract.
The Gastrointestinal Tract © Sebastian Kaulitzki / Fotolia
The Location of the Stomach
The stomach is located in the upper left abdomen, directly beneath the diaphragm. It connects the duodenum to the esophagus and performs numerous other functions related to digestion.
The gallbladder and liver are located directly to the right of the stomach. The spleen is situated on the opposite side. Finally, the large intestine and the small intestine are located below the stomach. The stomach therefore occupies a central position in the human digestive tract.
Functions of the Stomach
The stomach’s main task is to store ingested food. It gradually releases it into the intestines to enable controlled digestion. This allows humans to meet their daily nutritional needs with just a few meals.
The duration of storage depends on several factors. Among other things, the composition and quantity of food have a decisive influence on this. While fruits and vegetables remain in the stomach for only about an hour on average, the stomach stores fatty foods for up to eight hours.
Furthermore, the stomach prepares the chyme for subsequent digestion. Through powerful muscle contractions, it mixes the food and ultimately transports it to the intestines.
In doing so, it also kills numerous pathogens, thereby functioning as part of the human immune system. For this purpose, it has what are known as parietal cells. These are located in the stomach wall and produce small amounts of concentrated hydrochloric acid as needed. This lowers the pH level in the stomach to two or three, causing most bacteria to die quickly.
The so-called parietal cells in the stomach wall therefore produce a protective layer of mucus that coats the entire mucous membrane of the stomach.
Common Stomach Disorders
In Germany, infections, inflammations, and cancers of the stomach are the most common conditions. People of all age groups are affected to the same extent. Inflammation of the stomach lining is primarily characterized by stomach acid increasingly attacking the lining on the inner wall of the stomach. Without medical treatment, so-called ulcers can develop rapidly. These are malignant sores that can lead to severe internal bleeding and, in rare cases, a perforated stomach.
Most stomach disorders are characterized by the following symptoms:
- Nausea and vomiting
- A feeling of pressure in the upper abdomen
- Pressure pain in the stomach area
- Loss of appetite
In addition to inflammation of the stomach lining (gastritis), a condition known as “irritable stomach” is also common in Germany. This condition does not cause any pathological changes in the stomach, but it still triggers the typical symptoms of a stomach disorder. Furthermore, many people are also affected by what is known as “stomach flu.” This illness spreads particularly quickly because it is characterized by a long incubation period and, in some cases, very mild symptoms.
Another stomach condition is gastroesophageal reflux disease (GERD), with heartburn as its primary symptom. In this condition, stomach acid flows back into the esophagus. This abnormal reflux is caused by a lower esophageal sphincter that no longer closes properly, as the video shows:
Finally, there are numerous new cases of stomach cancer each year. Find a specialist who can help you.
What causes these stomach disorders?
Stomach disorders generally have a variety of causes. In most cases, however, they are triggered by the following factors:
- Bacteria
- Viruses
- Fungi
- hereditary conditions
- Heavy alcohol consumption
- Smoking
- Incompatible medications
- unhealthy diet
Gastritis, a common condition, is generally caused by an acute imbalance between the stomach’s acid defense mechanisms and acid production. Medications, bacteria, or viruses are usually responsible. Smoking and alcohol consumption contribute to the development of the disease.
Chronic conditions are often triggered by the bacterium Helicobacter pylori. It causes deep wounds in the stomach and duodenum, thereby contributing to the formation of ulcers.
In most cases, hereditary factors are the primary contributors to the development of stomach cancer. In addition, an unhealthy diet is also responsible for many diseases. Infections with Helicobacter pylori, as well as heavy smoking and frequent alcohol consumption, increase the risk of developing cancer. Irritable stomach, on the other hand, has no known causes. Since doctors have not yet been able to identify a clear cause, eating disorders, stress, and food intolerances are considered potential triggers.
Here you can find specialists in stomach cancer.
How are stomach diseases diagnosed?
Doctors have numerous proven methods at their disposal for diagnosing these conditions. These primarily include:
- physical examination
- stool test
- Ultrasound
- X-ray examination
- gastroscopy
- Computed tomography (CT) and magnetic resonance imaging (MRI)
Almost every doctor begins with a physical examination. They primarily palpate the patient’s abdomen and listen for bowel sounds with a stethoscope. Often, the diagnosis is made based on a pain response typical of a specific disease. However, if the examination does not yield the desired result, a stool test is usually performed in cases of diarrhea and bloody stools.
Otherwise, the doctor will order a variety of specialized tests to definitively diagnose the stomach condition. In addition to X-rays, endoscopies play a particularly central role in this process. The advantage of this is that the doctor can take tissue samples during the procedure, which are then examined in detail later. It is therefore advisable to find an experienced and professional specialist.
FAQ
What is the stomach, and where is it located?
The stomach is a hollow organ in the digestive system and is located in the upper left abdomen beneath the diaphragm. Anatomically, it connects the esophagus to the duodenum. This location of the stomach allows food to be passed into the intestines.
What is the stomach’s role in digestion?
The stomach’s function is to store food, break it down, and mix it with digestive juices. Stomach acid, enzymes such as pepsin, and digestive enzymes chemically pre-digest the ingested food. The chyme is then released into the small intestine in small portions.
What is the structure of the stomach?
The stomach consists of several sections: the cardia, the fundus, the body of the stomach (corpus), and the pylorus. The stomach wall consists of several layers, including the mucous membrane, a layer of connective tissue, and smooth muscle. This structure enables peristaltic movements and the mixing of the chyme.
What substances does the stomach produce?
The glands in the stomach’s mucous membrane produce gastric juice, which contains hydrochloric acid, mucus, and enzymes. Parietal cells produce hydrochloric acid and are also involved in the absorption of vitamin B12. Chief cells produce pepsin, which breaks down proteins.
What conditions can affect the stomach?
The most common diseases of the stomach include gastritis and peptic ulcers. Infections with the bacterium Helicobacter pylori can also damage the stomach lining. Such diseases can lead to pain in the upper abdomen, indigestion, or inflammation.
