stomach overview for patients

Overview

Your stomach is a J-shaped muscular pouch in your upper abdomen. It connects your food pipe (oesophagus) to your small intestine. Its main job is to break down food into a liquid mixture using acid and digestive enzymes, so your body can absorb nutrients later in your intestines.

Stomach symptoms like indigestion, bloating, and heartburn are very common. Many people have them from time to time. More serious stomach conditions are less common, but they do happen.

Stomach problems can affect anyone at any age. Babies and children can have them, older adults often do, and people with certain risk factors (like an H. pylori infection, smoking, or a family history of stomach disease) may have higher chances of developing them.

Symptoms

Common symptoms

• Pain or burning in the upper belly
• Bloating or feeling too full after eating
• Nausea or vomiting
• Heartburn (a burning feeling in the chest)
• Loss of appetite
• Burping or gas
• Dark stools or blood in stool (a warning sign)

Symptoms in children

• Tummy pain, often around the belly button
• Vomiting or gagging
• Refusing to eat or eating very little
• Fussiness or crying after meals
• Diarrhoea or constipation
• Fever (sometimes)

Symptoms in older adults

• Vague belly discomfort instead of sharp pain
• Poor appetite and unintended weight loss
• Feeling full quickly
• Nausea or vomiting
• Dark, tar-like stools (a sign of bleeding)
• Tiredness (from anaemia caused by blood loss)

Causes

Main causes

• Infection with a bacterium called Helicobacter pylori (H. pylori)
• Stomach acid irritating the lining (gastritis)
• Peptic ulcers (sores in the stomach lining)
• Gastro-oesophageal reflux disease (GORD) – acid moving up into the food pipe
• Stomach cancer (much less common)
• Functional dyspepsia (indigestion with no visible cause on tests)
• Food intolerances, such as lactose intolerance
• Medicines that irritate the stomach, like some pain relievers
• Heavy alcohol use or smoking

Risk factors

• Chronic H. pylori infection
• Long-term use of certain medicines for pain, such as some pain relievers
• Smoking or chewing tobacco
• Heavy alcohol use
• Diet high in smoked, salted, or pickled foods
• Family history of stomach cancer
• Age 60 or older
• Obesity
• Prolonged stress

When to see a doctor

See a doctor urgently if:

• You vomit blood or what looks like coffee grounds.
• You have black, tar-like stools.
• You have severe belly pain or a rigid, tender belly.
• You have trouble swallowing or breathing with stomach symptoms.

Book a routine appointment if:

• Stomach symptoms that last more than 3 or 4 days.
• Frequent heartburn or indigestion that returns after treatment.
• Unexplained weight loss.
• Feeling full very quickly with small meals.
• Changes in appetite or bowel habits.

Diagnosis

A doctor will first ask about your symptoms, medical history, medicines, and family history. Then they will examine your belly gently. Based on what they find, they may recommend tests. No single test works for everyone; it depends on your exact symptoms.

Tests that may be done

• Blood tests to check for anaemia, infection, or organ problems
• Stool tests to look for hidden blood or markers of inflammation
• Breath test or stool antigen test for H. pylori infection
• Upper endoscopy (gastroscopy) – a thin, flexible camera passed through your mouth, usually with sedation, to see your stomach lining and take small tissue samples (biopsies)
• Imaging tests, such as an X-ray or CT scan, to get a picture of your abdomen

What to expect at your appointment

You may be asked to fast (nothing to eat or drink) for several hours before some tests. For an endoscopy, you will receive a sedative to keep you comfortable; most people feel sleepy and remember little of the test. You can usually go home the same day. Biopsy results can take a few days to a week.

Treatment

Treatment depends on the cause of your stomach problem. Many conditions improve with simple measures and medicines that reduce or neutralise stomach acid. Others need antibiotics or more specialized care. Your doctor will work with you to create a plan for your situation.

Self-care at home

• Eat smaller, more frequent meals instead of large ones.
• Avoid foods that trigger you – common ones include spicy, fatty, or very acidic foods.
• Don't lie down within 2–3 hours after eating.
• Raise the head of your bed by 10–15 cm to keep acid from rising at night.
• Quit smoking and limit alcohol.
• Manage stress with breathing exercises, walks, or mindfulness.

Medical treatments

Many stomach conditions are treated with medicines that reduce or neutralise stomach acid, protect the stomach lining, or stop nausea and vomiting. If a bacterial infection like H. pylori is found, your doctor will prescribe a combination of medicines, usually including antibiotics. Always take medicines exactly as directed. Do not stop without checking with your doctor.

When is surgery considered?

Surgery is only needed in certain situations, such as a bleeding ulcer that cannot be controlled, a perforation (a hole) in the stomach, an obstruction (blockage) that prevents food from passing, or stomach cancer. The type of operation varies; your surgeon will explain the details and alternatives.

Living with this condition

Keep a simple daily record of your meals, medicines, and symptoms for a few weeks. This can help you and your doctor spot patterns. Take your medicines on time and keep follow-up appointments. Remember that recovery takes time – it's okay to have good days and bad days.

Lifestyle tips

• Eat a balanced diet rich in fruit, vegetables, and whole grains.
• Stay active – gentle exercise like walking or swimming is often helpful.
• Keep a healthy weight, as extra belly weight can push acid upward.
• Limit caffeine, alcohol, and carbonated drinks if they bother you.
• Get enough sleep; lack of rest can make digestive symptoms worse.
• Involve your family or friends in your health journey for support.

Diet and exercise

Aim for regular meals and include a variety of fibre-rich foods. Fibre helps digestion, but introduce it slowly to avoid gas. Drink plenty of water. For exercise, gentle to moderate activity most days can improve digestion. Avoid intense workouts right after a large meal, as this can cause discomfort.

Mental health and emotional wellbeing

Living with persistent stomach symptoms can be stressful, embarrassing, or draining. It may affect your mood, sleep, and social life. If you feel anxious or depressed, tell your doctor. They can suggest counselling, support groups, or other ways to help you cope. You are not alone.

Prevention

You cannot prevent every stomach condition, but many can be avoided. Eat a healthy diet, limit alcohol and avoid smoking, practice good hygiene (like washing hands), and be cautious with pain relievers – always follow the label or ask your pharmacist.

Vaccines

There is no vaccine for stomach cancer or most stomach infections. However, staying up to date with routine immunisations can protect you from infections that might affect your overall health.

Screening programmes

Routine stomach screening is not offered to everyone. If you have risk factors like a family history of stomach cancer or a known H. pylori infection that has been treated, your doctor may recommend an endoscopy at regular intervals to check for early changes.

Complications

If left untreated

• Bleeding from the stomach, which can lead to anaemia and weakness.
• Perforation – a hole in the stomach wall, a surgical emergency.
• Blockages that stop food from moving into the intestine.
• Spread of H. pylori infection, increasing ulcer risk.
• In rare cases, progressive cell changes that may lead to stomach cancer.

Long-term outlook

The outlook for most stomach problems is very good. Many conditions can be cured or managed with the right treatment. Even serious diagnoses like stomach cancer are more treatable when found early. Work with your healthcare team, follow your plan, and be kind to yourself during recovery.

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