Recetas Medicas logo
Back to facts and advice
general-health

Stomach ailment: causes, symptoms and treatment

May 28, 2026

Stomach flu, or stomach flu, is a very contagious disease that often breaks out quickly. The most common symptoms are diarrhoea, vomiting, nausea and stomach ache. Having a stomach bug can be very uncomfortable and you can feel really…

Stomach ailment: causes, symptoms and treatment

Stomach sickness | Stomach Flu - Symptoms and Treatment | Recetas Medicas

Stomach flu, or stomach flu, is a very contagious disease that often breaks out quickly. The most common symptoms are diarrhoea, vomiting, nausea and stomach ache. Getting sick with a stomach bug can be very unpleasant and you can feel really bad, but the illness usually goes away on its own within a few days. Here we go through common causes of stomach flu, which symptoms are most common and what you can do to reduce the risk of getting infected.

Stomach symptoms

Stomach symptoms often come on suddenly. The most common symptoms are:

  • Diarrhea
  • Vomiting
  • Nausea
  • Stomach pains

You may also have a fever, headache and body aches.

How is stomach flu transmitted?

Stomach illness can spread in different ways depending on what caused the infection. It is most common to be infected through direct contact with a sick person, for example if you take care of someone who has a stomach bug and then touch your mouth or face without washing your hands first. It is also common to become infected by touching objects or surfaces that a sick person has touched, such as doorknobs, cutlery or towels, or by eating food or drinking water that has become contaminated with the virus or bacteria that cause stomach flu.

Stomach disease can also be spread via water that has been contaminated and used to rinse food, which means that the food itself can become a source of infection. A typical example is frozen berries that are consumed without first being heated. Some types of stomach flu, such as norovirus, are extremely contagious and only require a very small amount of virus particles to cause infection. This means that the spread of infection can happen very easily, especially in places where people are close to each other, such as in schools, preschools, hospitals and nursing homes. It is therefore important to be careful with hygiene, above all to wash your hands properly with soap and water, to reduce the spread of infection.

Incubation period for stomach flu

The incubation period for stomach flu varies depending on the cause of the infection, but you often get sick within one to three days of being infected. In food poisoning, which can sometimes be mistaken for a stomach bug, symptoms can come on more quickly, often within just a few hours of consuming contaminated food.

How long is stomach flu contagious?

Stomach illness can be contagious both during the incubation period, before the first symptoms even appear, and several days after you start to feel better. To reduce the risk of spreading the disease to others, it is important to be careful with your hygiene, especially to wash your hands thoroughly with soap and water. Adults should stay home from work and other social contexts until they have been symptom-free for at least 48 hours, to be sure they are no longer contagious.

Treatment and recovery

Most people who get an upset stomach do not need treatment. The disease goes away on its own after a few days. There are a few things you can do yourself to feel better and recover faster from a stomach bug.

It is important to get fluids

Vomiting and diarrhea can lead to severe dehydration and dehydration. It is therefore very important that you take in more liquid than usual when you have an upset stomach. Try to drink small amounts of fluid regularly. You can use a tablespoon if you have difficulty swallowing water. Fluid replacement is also a good option. Avoid drinks that are high in sugar or contain caffeine as they can make the diarrhea worse.

What can you eat to restore your stomach after an upset stomach?

After a bout of stomach upset, it is important to slowly restore the stomach's function and balance. Once the vomiting has subsided, you can carefully start eating small portions of regular food and gradually increase to a normal diet. Feel free to start with easy-to-digest food such as rice, boiled potatoes and white bread. Avoid spicy, fatty and high-fiber foods until you are fully recovered. Listen to your body and increase your intake of regular food as you feel better.

When should I seek care?

Most people who get a stomach bug get well without needing treatment.

Contact healthcare if you feel very tired and weak, have had persistent diarrhea for more than a week, have been vomiting for more than 24 hours without improvement, or if you have heart failure, diabetes or another serious illness and get an upset stomach. You should also seek care if you experience symptoms of dehydration, such as dry mouth, increased thirst, dark urine and urinating less than usual.

Seek urgent care if:

  • you have bloody diarrhea or vomit blood
  • you have severe stomach pains
  • you get a high fever and chills in connection with the stomach bug

Stomach disease in children

Children are more sensitive to dehydration and dehydration than adults. It is therefore important to ensure that the child gets plenty of fluids. Offer small amounts of liquid at a time, but often - larger amounts may cause the child to vomit again. Pay attention to signs of dehydration, such as the child urinating less than usual, passing dark urine, having dry lips and feeling more tired than usual. Seek emergency care if your child shows signs of severe dehydration.

Stomach ache during pregnancy

Having a stomach bug during pregnancy can be worrying and unpleasant, but it is usually not dangerous for either the mother-to-be or the fetus. The fetus cannot get stomach upset in the same way as adults, but it can be affected by dehydration. Therefore, it is important that you take in a lot of liquid if you get an upset stomach during pregnancy.

Frequently asked questions about stomach flu and stomach flu

Can you have an upset stomach without vomiting?

Yes, it is possible to have an upset stomach without vomiting. Stomach disease manifests itself differently in different people. Some only get diarrhea and stomach aches, while others may also feel feverish and nauseous. It depends on what is causing the upset stomach and how the body reacts to it.

Is stomach flu contagious before it breaks out?

Yes, you can infect others with stomach flu before you feel any symptoms yourself. This means that you can spread the disease to others even before you know that you are sick yourself.

When is stomach flu most contagious?

Stomach flu is most contagious when you have clear symptoms such as vomiting and diarrhea, but you can still infect others even after you start to feel better. Sometimes you can be infected for as long as several days or weeks, depending on the type of virus or bacteria that caused the disease.

Is stomach flu airborne?

Stomach flu is not usually spread through the air in the same way as a cold, where the virus is spread through droplets in the air when a sick person coughs or sneezes. Stomach disease is mainly spread through direct contact with a sick person or by touching surfaces that the sick person has been in contact with. Small droplets that are spread when someone vomits can contribute to the spread of infection if you are very close.

How do I know if it's a stomach bug or food poisoning?

Stomach illness and food poisoning can feel very similar as both can cause symptoms such as vomiting, diarrhea and stomach ache. The biggest difference lies in how quickly you get sick. Food poisoning often starts within a few hours to a day of eating bad food, while stomach upset can take a little longer to develop. Food poisoning often goes away within a day, while stomach flu usually lasts longer.

More facts and advice