GI & Abdominal Infections

A gastrointestinal or abdominal infection is an infection of the digestive tract or of the organs and spaces inside the abdomen — ranging from food- and water-borne gastroenteritis to typhoid, liver abscess and abdominal tuberculosis.

Most stomach upsets are short-lived and need nothing more than fluids and time. The ones that matter here are different: diarrhoea that lasts weeks, fever with abdominal pain, or weight loss that nobody can account for.

Symptoms of GI and abdominal infections

• Diarrhoea lasting more than a few days, or containing blood or mucus
• Vomiting that prevents you keeping fluids down
• Abdominal pain or cramping that persists rather than passing
• Fever alongside abdominal discomfort
• Unintended weight loss, or loss of appetite over weeks
• Persistent bloating or a swollen abdomen

When should you see a specialist for a GI or abdominal infection?

• Diarrhoea continuing beyond two weeks
• Blood in the stool, or black tarry stools
• Fever with pain in the upper right abdomen, which may indicate a liver abscess
• Weight loss with abdominal pain and evening fever — a pattern that raises the possibility of abdominal tuberculosis
• Symptoms that began after travel, or after a known food- or water-borne outbreak
• Signs of dehydration: very little urine, dizziness on standing, or persistent drowsiness
• Any of the above in someone immunosuppressed or recently on antibiotics

Frequently asked questions about GI and abdominal infections

Is food poisoning the same as a gut infection?

Food poisoning is one kind of gastrointestinal infection, caused by contaminated food or water. Others spread person to person, through untreated water, or arise from organisms already present in the gut after antibiotics disturb its balance.

Do I need antibiotics for diarrhoea?

Often not. Many infectious diarrhoeas resolve without antibiotics, and taking them unnecessarily can prolong illness and drive resistance. Whether they help depends on the organism, the severity, and your overall health — which is why testing sometimes matters more than treating immediately.

What is typhoid, and how is it caught?

Typhoid is a bacterial infection spread through contaminated food and water, which typically causes sustained fever, abdominal discomfort and marked tiredness rather than dramatic diarrhoea. It is diagnosed by laboratory testing and needs proper treatment rather than waiting it out.

Can tuberculosis affect the abdomen?

Yes. Tuberculosis is not confined to the lungs and can involve the intestines, the lining of the abdomen or the lymph nodes within it. It tends to present slowly, with weeks of vague pain, fever and weight loss, which is why it is easily missed.

When does dehydration become dangerous?

When fluid losses outpace what you can drink. Passing very little urine, feeling faint on standing, or becoming drowsy are signals to seek care promptly rather than continuing at home — particularly in children and older adults.

Conditions related to GI and abdominal infections

Where fever persists and the abdomen is not obviously the source, see Fever of Unknown Origin. Typhoid and several other causes overlap with Tropical Infections. Gut infections behave differently under immunosuppression — see Transplant Related Infections.

Our infectious disease specialist follows a comprehensive diagnostic approach using detailed history, clinical examination, and advanced investigations to identify the root cause and provide effective treatment.