Hong Kong’s sixth most common cancer strikes silently, with over half of patients diagnosed only after the disease has spread, drastically reducing survival odds.
According to the Hospital Authority’s Hong Kong Cancer Registry, stomach cancer ranked as the territory’s sixth most frequent malignancy in 2019 and claimed the sixth-highest number of cancer-related lives, trailing only liver cancer. The disease is notoriously stealthy; its early symptoms are so subtle that many patients only discover their condition when treatment options are already limited.
Why Stomach Cancer Often Goes Undetected
The stomach is what physicians call a “silent organ.” It lacks pain nerve endings, meaning discomfort typically arises only when a tumour has invaded nearby tissues. Moreover, the stomach’s spacious interior allows growths to become quite large before causing blockages.
“When patients feel pain, the cancer or ulcer is already severe,” explains Associate Professor Dr. Chiang Kun-jun, a surgeon. He notes that outcomes differ dramatically between early-stage (Stage I and II) and late-stage (Stage III and IV) detection. Alarmingly, more than half of patients are diagnosed at advanced stages, often because they have never undergone a routine gastroscopy.
Surprising Trends: Younger Women at Risk
While stomach cancer predominantly affects men aged 50 to 70, a distinct pattern emerges among younger patients. Dr. Chiang points out that the majority of stomach cancer cases in individuals under 50 are women, and these tend to be diffuse-type stomach cancer – a particularly aggressive form that spreads across the entire stomach lining and peritoneum rather than forming a localized tumour.
One case involved a female patient who had no symptoms until her appetite waned and her abdomen swelled. She had lost only two kilograms, but her jaundiced skin suggested liver disease. A gastroscopy revealed terminal diffuse stomach cancer; malignant cells had already carpeted her abdominal cavity.
Key Warning Signs and Risk Factors
Stomach cancer symptoms often mimic those of gastritis or ulcers, making self-diagnosis unreliable. The seven key warning signs include:
- Persistent indigestion or loss of appetite
- Rapid, unexplained weight loss
- Abdominal bloating
- Feeling uncomfortably full after small meals
- Nausea, vomiting, or vomiting blood
- Blood in stool or black, tarry stools
- Fatigue, weakness, and anaemia
Who Is Most Vulnerable?
Medical experts identify several high-risk groups:
- Family history: One patient, whose father, brother, and grandfather all had stomach cancer, began annual gastroscopies at age 30. At 31, doctors found Stage 0–1 cancer, which was removed via endoscopy without major surgery.
- Long-term medication users: Those taking steroids or non-steroidal anti-inflammatory drugs (NSAIDs) face increased risk. A young woman who routinely took painkillers for menstrual cramps eventually vomited blood due to a bleeding ulcer.
- Lifestyle factors: Smoking, heavy alcohol consumption, and obesity.
- Psychological stress: Perfectionists, individuals under chronic pressure, or those with emotional instability produce excess stomach acid, which can lead to ulcers.
- Blood type A has also been linked to higher susceptibility.
Dietary Habits That Harm the Stomach
Nutritionist Chao Han-ying and other specialists warn against five common dietary patterns that increase stomach cancer risk:
- Processed and pickled foods – Items like preserved radish and pickled vegetables contain artificial colours and preservatives linked to gastric malignancies.
- Heavy, greasy, or fried foods – Dishes such as croquettes and fried chicken generate high levels of free radicals, which can trigger cellular mutations in the stomach lining.
- Extremely spicy or scalding-hot foods – Gastroenterologist Dr. Yang Tzu-wei treated a 23-year-old who loved intensely spicy, piping-hot meals. Despite a distended abdomen, his limbs remained thin. An ultrasound revealed ascites – fluid in the abdomen – and a gastroscopy confirmed terminal stomach cancer.
- Irregular eating schedules – A 36-year-old financial executive drank black coffee in the morning, snacked on pastries mid-afternoon, and devoured a large bowl of beef noodles with 15 dumplings at 10 p.m. Within three months, he gained 10 kilograms, developed chronic indigestion, and suffered from gastric ulcers.
- Leftover vegetables – Nurse Chen Li-hua notes that reheated dishes, especially greens, may accumulate nitrates. Modern farming uses nitrogen fertilizers, and younger vegetables tend to have higher nitrate levels. Spinach, bok choy, celery, and Chinese basil are among the common high-nitrate vegetables.
Protective Foods for a Healthy Stomach
Nutritionist Chao recommends four stomach-friendly ingredients:
- Cabbage – Contains antioxidant phytochemicals and sulphur compounds that help reduce inflammation in chronic gastritis.
- Seaweed or wakame – Its soft texture and mucilaginous fibres create a protective coating on the stomach lining.
- Camellia seed oil – Rich in polyphenols, this oil can be drizzled over dishes or used in stir-fries to combat inflammation.
- Black fungus – Soft and gentle on the stomach, it provides dietary fibre that supports the stomach wall without causing irritation.
The Role of Helicobacter pylori
Bacterial infections can also trigger cancer. Helicobacter pylori infection causes recurring gastric inflammation and ulcers; over time, this chronic damage may evolve into malignancy. Testing and treatment for H. pylori are essential preventive measures.
When to Get Screened
Doctors advise that individuals without a family history should begin gastroscopy screening at age 45. For those with relatives who developed stomach cancer – for instance, if a parent was diagnosed at 40 – screening should start five to ten years earlier, around age 30 to 35.
Practical Tips for Busy Professionals
For those whose schedules make regular meals difficult, nutritionists suggest carrying portable snacks like edamame. These protein-rich legumes neutralize stomach acid and provide longer-lasting satiety compared to sugary biscuits, which can actually stimulate acid secretion. Water is preferable to milk or lattes, as dairy products may increase gastric burden.
A Call for Awareness
Stomach cancer remains a formidable public health challenge in Hong Kong, not because it is untreatable, but because it is so often discovered too late. As one patient who had planned retirement and world travel after a lifetime of careful eating learned, even the most disciplined lifestyle does not guarantee immunity. The message from physicians and dietitians is clear: listen to subtle bodily changes, adopt stomach-friendly eating habits, and prioritize regular screening. Early detection can mean the difference between a minor endoscopic procedure and losing the entire stomach – or worse.
For further information, consult the Hospital Authority Hong Kong Cancer Registry, the Centre for Health Protection, or the Hong Kong Cancer Fund.