Stomach cancer key symptoms that should not be ignored and the latest treatment methods

Stomach cancer is a disease that develops gradually, and in many cases, it starts with mild and subtle symptoms — which makes early detection difficult for many people. Over time, the lining of the stomach may change due to several factors such as poor nutrition, smoking, chronic inflammation (especially infections caused by H. pylori bacteria), as well as some genetic and hereditary factors.Understanding the causes of the disease and recognizing the early symptoms can make a huge difference, as it helps in detecting cancer at the right time and starting treatment before it spreads.In this Dalely Medical article, we will explain in detail the causes of stomach cancer, the main risk factors, the warning signs that might indicate it, and the latest treatment options available.

Is stomach cancer contagious?

No, stomach cancer is not a contagious disease. What can be transmitted is the H. pylori infection, which is one of the risk factors — but the cancer itself cannot be passed from one person to another.

Can stomach cancer come back after treatment?

Yes, in some cases the disease can return, especially if it was diagnosed at an advanced stage. That’s why follow-up appointments after finishing treatment are extremely important.

Can healthy food cure stomach cancer?

Healthy nutrition is great for immunity and overall health — but on its own, it does not cure cancer. Main treatment depends on the case: surgery, chemotherapy, targeted therapy, or immunotherapy.

Can stomach cancer happen at a young age?

Although it is more common in people over 50, it can still appear in younger ages — especially if there are genetic factors or chronic inflammation in the stomach.

Is chemotherapy required in every case?

Not necessarily. Some cases need surgery only, while others may need chemotherapy before or after surgery — depending on the stage and the treatment plan.

Does stomach cancer always cause pain?

No. Many cases start with very mild symptoms such as indigestion and loss of appetite without obvious pain — which is why some people get diagnosed late.

What is the difference between benign and malignant stomach tumors?

Benign tumors do not spread in the body and usually do not turn into cancer. Malignant tumors spread into surrounding tissues and can spread to other organs like the liver and lymph nodes.

Is it possible to fully recover if stomach cancer is diagnosed early?

Yes. In many cases, complete cure is possible if stomach cancer is discovered in the early stage. Survival rates are much higher in Stage 1 compared to advanced stages.

Is stomach cancer always malignant?

Stomach cancer itself is a malignant tumor. Benign tumors in the stomach are rare, but if they appear, they should be monitored because some of them can turn malignant if not treated early.

What is the survival rate of stomach cancer?

There is no fixed percentage for all patients. But studies show that early surgical removal can reach up to 90% success — which proves the importance of early diagnosis and regular monitoring.

Does stomach cancer lead to death?

The cancer itself is not the direct cause — but the complications can become severe. Early detection and proper treatment reduces the risk of life-threatening complications.

Can stomach cancer occur without weight loss?

Yes. In early stages there might be no obvious weight loss — sometimes symptoms are subtle like indigestion or reduced appetite.

Should patients follow a special diet during treatment?

It is recommended to follow a light, easy-to-digest diet during treatment. But the diet should be personalized according to each patient’s condition and with a nutritionist’s guidance.

Is surgery always needed to remove part of the stomach?

Not always. In very early cases the tumor may be removed endoscopically — without major surgery or large resection.

Does acid reflux cause stomach cancer?

Acid reflux (GERD) is more strongly linked to esophageal cancer. But chronic inflammation in the digestive system in general can increase the risk of some cancers if left untreated for a long time.

Can regular blood tests detect stomach cancer?

No. Routine blood tests do not diagnose gastric cancer. They may show anemia or nutritional deficiencies — but definitive diagnosis needs endoscopy and more specific tests.

Is immunotherapy effective for stomach cancer?

Immunotherapy can be very effective in selected cases — especially in advanced cancer or when the tumor has specific biomarkers (such as PD-L1) that make it responsive to immune therapy.

Does chronic gastritis increase the risk?

Yes. Chronic gastritis — especially due to H. pylori — is one of the most important risk factors. Long-term untreated inflammation makes stomach cells more likely to transform into cancer.

Does genetics play a role in stomach cancer?

Yes. Genetics can have a role in some cases. If more than one family member has stomach or colon cancer, the risk increases. Some hereditary syndromes — such as CDH1 mutations — carry a much higher risk.

What are the main causes of stomach cancer?

Stomach cancer has several interconnected causes. The most important ones are:

1) H. pylori infection
One of the most significant and treatable causes. Chronic infection causes long-lasting inflammation in the stomach lining, and over time the cells may transform into cancer cells.

2) Dietary habits
• smoked foods
• canned and processed meats
• pickles and highly salted foods

These foods increase carcinogenic substances that damage the stomach lining.
Also, low intake of fruits and vegetables reduces antioxidants that naturally protect cells.

3) Genetics and hereditary cancer syndromes
In some families, specific genetic mutations (like CDH1) significantly increase the risk of stomach cancer.

4) Chronic stomach conditions

Such as:

• Atrophic gastritis
• Pernicious anemia
• Certain types of gastric polyps

All of these conditions change the stomach environment and increase the likelihood of malignant transformation.

5) Viruses and microbial factors

In some cases, infection with Epstein-Barr Virus (EBV) is associated with changes in the stomach cells that may lead to cancer.

6) Smoking, alcohol, and obesity

Smoking and alcohol are major contributing factors.
Obesity causes chronic inflammation throughout the body — which increases cancer risk as well.

7) Exposure to industrial chemicals

Some chemicals used in coal and rubber industries — when exposure is long-term — may increase the risk of stomach cancer.

Symptoms of stomach cancer based on stage

Stage 1

The tumor is still small and limited to the inner stomach layers. Symptoms at this stage are very mild or absent:

• Feeling full quickly after small meals
• Mild bloating after eating
• Slight indigestion or heartburn
• Heavy feeling in the stomach

Note: About 70% of patients at this stage do not have obvious symptoms, which is why many cases are diagnosed late.

Stage 2

The tumor grows deeper and may reach nearby lymph nodes. Symptoms become more noticeable:

• Pain in the upper abdomen (especially after meals)
• Persistent bloating and gas
• Gradual loss of appetite
• Frequent nausea
• Mild weight loss

Many patients think it’s just “ulcers” or “gastritis” and only take antacids!

Stage 3

The tumor spreads more aggressively and involves more lymph nodes:

• Persistent pain not only related to meals
• Vomiting — may contain blood
• Black tarry stools (due to internal bleeding)
• Anemia and chronic fatigue
• Noticeable weight loss
• Difficulty swallowing or sensation of food “getting stuck” if the tumor is near the stomach outlet

Stage 4 (Metastatic stage)

Cancer spreads to other organs such as liver, lungs, pancreas, or peritoneum:

• Severe constant pain
• Extreme weakness and fatigue
• Severe weight loss
• Complete loss of appetite
• Jaundice (if the liver is involved)
• Abdominal swelling due to fluid (ascites)
• Persistent nausea and vomiting

Staging of stomach cancer (TNM system)

T = how deep the tumor has invaded the stomach wall
N = number of affected lymph nodes
M = whether the cancer has spread to other organs

The 4 main stages are:

Stage 1

Small tumor, limited to inner layers
→ Best stage for cure if detected early

Stage 2

Tumor invading deeper layers with more lymph nodes involved
→ Disease progressing but still treatable effectively

Stage 3

Large local spread or involvement of many lymph nodes
→ Requires aggressive treatment (usually surgery + chemotherapy)

Stage 4 (Metastatic)

Spread to other organs such as liver / lungs / pancreas
→ Goal of treatment is symptom control & improving quality of life

Types of stomach cancer

1) According to cell type (Lauren classification)

Intestinal type

Most common worldwide
Linked to diet such as salty foods, smoked meats, canned products
Develops gradually from inflammation → precancerous changes → cancer
Usually occurs in older adults

Diffuse type

Spreads throughout the stomach wall without forming a clear mass
More related to genetic mutations (like CDH1)
Occurs at younger age
More aggressive and fast spreading

Sometimes mixed type appears — a combination of both.

2) According to tissue of origin

• Adenocarcinoma → most common (more than 90%)
• Sarcoma → very rare, from muscle or connective tissue
• Lymphoma → from immune cells, sometimes related to H. pylori
• GIST (Gastrointestinal Stromal Tumor) → from special cells in stomach wall (may be benign or malignant)

3) According to tumor location

• Upper stomach (Cardia)
• Middle part (Body)
• Lower stomach (Antrum)

Location affects surgery type, reconstruction, and follow-up.

Diagnosis of stomach cancer

Before answering the question “Can stomach cancer be cured?”, accurate diagnosis is essential.

Main diagnostic tools include:

Endoscopy
Direct visualization of the stomach using a camera — most accurate method.
Biopsy
A sample of abnormal tissue analyzed in the lab — the definitive confirmation.
Blood tests
Not diagnostic — but may reveal anemia or low nutrition.
Endoscopic Ultrasound (EUS)
Shows how deep the tumor has invaded and whether lymph nodes are affected.
CT Scan
Detects spread to liver, lymph nodes, pancreas, etc.
MRI
Useful for detailed soft tissue evaluation.
Diagnostic laparoscopy
Used when imaging is unclear — checks for small hidden metastases.

Treatment of stomach cancer

Treatment varies according to stage, tumor type, age, and overall health.

Methods include:

1) Chemotherapy

Kills cancer cells or stops their growth.
Used before surgery (neoadjuvant), after surgery (adjuvant), or in advanced cases.

Examples (non-brand names):
5-FU, Cisplatin, Oxaliplatin, Capecitabine

2) Radiotherapy

High-energy rays to destroy cancer cells.
Used alone or with chemotherapy.

3) Targeted therapy

Targets specific markers like HER2.
More precise and generally fewer side effects.

4) Immunotherapy

Activates the immune system to attack cancer cells.
Used mainly in advanced or recurrent cases with certain markers (e.g. PD-L1).

5) Palliative / Supportive care

To improve comfort and reduce symptoms like pain, nausea, and poor appetite.

Surgical treatment

Surgery is the most effective treatment in early and resectable stages.

Types:

• Partial gastrectomy — remove only the affected part
• Total gastrectomy — remove entire stomach + lymph nodes
• Lymph node dissection — essential to check spread and reduce recurrence

Minimally invasive surgery (laparoscopy / robotic)

Used mainly in early stages.
Benefits: less pain, shorter hospital stay, faster recovery.
But not suitable for all — depends on tumor stage, location, and patient condition.

What to do & what to avoid with stomach cancer

What to do

• Balanced diet (vegetables, fruits, lean proteins, whole grains)
• Keep follow-up appointments
• Take medication exactly as prescribed
• Good sleep & stress reduction
• Light physical activity (walking) if allowed by doctor

What to avoid

• Ignoring serious symptoms (vomiting blood, severe pain, rapid weight loss)
• Processed meats, smoked foods, heavy salted foods
• Smoking & alcohol
• Taking medications on your own — especially strong pain killers or antacids for long periods