Food poisoning occurs when the body ingests food or drinks containing pathogenic microorganisms, such as bacteria, viruses, or parasites. The severity and onset of symptoms depend on various factors, including the type of pathogen, the amount of toxins ingested, the patient's immune response, and their underlying health condition.

Master of Science, Doctor Ho Thi Ha Phuong, from the Department of Gastroenterology - Hepatobiliary - Pancreas, Tam Anh General Hospital Hanoi, explained that some bacteria cause illness by invading the intestinal lining and triggering an inflammatory response. Others produce toxins that directly affect the digestive system or nervous system. This difference leads to diverse clinical manifestations, ranging from mild fatigue to acute digestive symptoms such as severe abdominal pain, vomiting, nausea, or acute diarrhea, headache, and body aches.

Early recognition of unusual post-meal symptoms is crucial for prompt detection and management, reducing the risk of dehydration, electrolyte imbalance, and severe infectious complications.

Fatigue, headache, and body aches

Many people experience only lethargy, headache, body aches, or a mild fever, similar to the flu, after food poisoning. This occurs because when the body encounters bacteria, viruses, or toxins in food, the immune system activates a response against the pathogens. This process can cause systemic symptoms before noticeable digestive symptoms appear.

Mild loss of appetite

Instead of severe vomiting, some individuals only feel bloating, indigestion, and a lack of appetite. These are common physiological responses when the digestive tract encounters harmful agents.

According to doctor Phuong, inflammatory mediators released during infection can affect the vomiting center in the medulla oblongata and slow down gastric emptying. This inhibits the body from absorbing more harmful substances but causes bloating, indigestion, and loss of appetite.

Persistent bloating

Toxins and inflammatory responses in the intestinal lining can alter digestive motility, causing mild spasms or increased gas production in the intestines. Instead of severe cramping, some people only experience prolonged bloating or discomfort. This sign is easily mistaken for irritable bowel syndrome, functional dyspepsia, or stomach conditions.

Doctors admit patients suspected of food poisoning. Illustration: Tam Anh General Hospital

Thirst, reduced urination, dizziness due to dehydration

Dehydration is one of the most common complications of food poisoning. Even with minimal vomiting or diarrhea, the body is still at risk of dehydration, leading to dry mouth, constant thirst, dark urine, infrequent urination, blurred vision, or dizziness.

If not rehydrated promptly, patients may experience symptoms such as dry lips, dry oral mucosa, reduced urination, dark urine, dizziness, low blood pressure, and extreme fatigue. Children, the elderly, pregnant women, and individuals with chronic diseases face a higher risk of dehydration and complications from food poisoning.

According to doctor Phuong, most mild food poisoning cases can recover on their own after a few days with adequate rest and hydration. However, patients should seek medical attention immediately if they experience signs of severe food poisoning, such as fever above 39 degrees Celsius, severe abdominal pain, continuous vomiting, inability to eat or drink, or diarrhea. Other signs like reduced or no urination, dizziness, confusion, or prolonged dehydration also require evaluation.

Hot and humid weather during summer creates favorable conditions for bacteria, viruses, and toxins to grow in food. Everyone should store and reheat food properly, cook food thoroughly, drink boiled water, wash hands with soap before preparing and eating food, and separate raw from cooked foods to prevent poisoning.

Ly Nguyen