Nausea is such a reflex, prescribed by nature to protect the body, and not amenable to conscious control. There is a feeling of an urgent need to snatch, which, in the future, most often happens. The feeling of nausea is primarily aimed at cleaning the digestive organs of substances harmful to the body, even if such substances enter the bloodstream and not from the intestines. Persistent nausea can occur from any specific odors, tastes, or other factors.
Permanent nausea is caused by a special nerve center located in the brain stem. Digestive tract receptors send signals to this center that trigger the gag reflex.
Constant nausea, the causes of which are most often associated with diseases of the digestive tract, can be a symptom of various other diseases of the digestive system.
For example, gastroenteritis, which manifests itself in the form of inflammation of the intestines or stomach and leading to food poisoning due to spoiled food, dirty water. Constant nausea is accompanied by diarrhea, weakness, abdominal pain, a slight increase in temperature. In such cases, frequent nausea gradually turns into vomiting and brings relief to the patient.
Gastric ulcer, gastritis are diseases of the digestive organs of long-acting. At the same time, constant nausea is the main symptom of these diseases and occurs with an exacerbation of the disease. At the same time, heartburn and stomach pain can occur.
Diseases of the liver and gall bladder also cause nausea and other manifestations in the form of bitterness in the mouth, darkening of urine, discoloration of feces, biliary colic, jaundice.
Acute appendicitis, cholecystitis, pancreatitis, bowel obstruction, as a rule, are characterized by severe attacks of nausea, severe abdominal pain, and a general sharp deterioration in the patient's well-being.
Narrowing the lumen of the pylorus or esophagus very often leads to a feeling of nausea after eating. Moreover, due to increased narrowing, nausea can also intensify.
With tumors of the intestine or stomach, nausea occurs at a late stage, when the tumor closes the entire lumen of the intestine.
Since nausea is caused by one of the centers of the brain, it can be a manifestation of certain diseases of the nervous system.
In brain tumors, an increase in intracranial pressure is often observed, accompanied by increased pressure of the fluid in the spinal cord and compression of the brain itself. In this case, nausea appears in the morning. With a sharp increase in intracranial pressure during traumatic brain injuries, bruises, cerebral edema, nausea can be replaced by severe vomiting, along with loss of consciousness.
Diseases caused by infection (meningitis, syphilis or AIDS) are also characterized by nausea. Moreover, vomiting and nausea are the first signs of meningitis.
The disease can also occur when the vestibular apparatus is disrupted, as a result of motion sickness or motion sickness. It is accompanied by a loss of balance, pronounced dizziness, especially with a sharp change in the position of the head and body.
A special manifestation of a headache is migraine, which is found in so many people. Against the background of a headache, severe nausea occurs, often turning into vomiting. The patient does not tolerate noise and light. Migraine attacks occur periodically and are triggered mainly by strong odors, cheese, chocolate, wine and other products.
When symptoms similar to migraine manifest, it is urgent to be examined by a neurologist. Since, perhaps, something serious is happening in the head, which needs to be identified and tried to eliminate.