15 Symptoms of Stomach Cancer

Stomach cancer may not cause noticeable symptoms in its earliest stages. When it does, people often describe vague pain, fullness, or discomfort above the navel.

In later stages, this may be linked to fluid buildup in the upper abdomen. The pain can come and go, ranging from dull to more severe.

Indigestion is a broad term for discomfort in the upper abdomen and can result from irritation or inflammation in the stomach.

While it can be a symptom of stomach cancer, it’s far more often linked to everyday causes like overeating or eating too quickly. Still, frequent or persistent indigestion — especially when paired with other symptoms — should be checked by a doctor.

Some people with stomach cancer find they get sick more often than usual.

When the immune system is focused on fighting cancer, the body may be more vulnerable to infections. If you’re noticing a pattern of getting ill more frequently, especially alongside other symptoms, it’s worth speaking with a healthcare provider.

A loss of appetite is common with stomach cancer and may last for days at a time.

This can lead to unintended weight loss, both from reduced food intake and from the body using more energy to fight the disease.

Bleeding in the stomach can show up in bowel movements.

Stools may appear dark or almost black when blood has been digested. While there are other causes of these changes, any noticeable shift in stool color or the presence of blood should be evaluated by a healthcare professional.

Many people with stomach cancer feel full after eating only a small amount.

This may be caused by fluid buildup or by a tumor partially blocking the stomach’s outlet to the small intestine. Early fullness can happen with other conditions as well, but it’s more concerning when it appears alongside other symptoms.

A buildup of stomach acid and digestive fluids can lead to ongoing nausea.

Some people also experience vomiting or a persistent urge to vomit. On its own, nausea isn’t specific to stomach cancer, but when combined with other symptoms, it may point to an underlying issue.

Fatigue can come from many causes, but ongoing, unexplained tiredness may signal something more serious.

In stomach cancer, small amounts of internal bleeding can lead to anemia, which in turn causes chronic fatigue.

Fever is one way the body responds to illness.

People with stomach cancer may experience recurring low-grade fevers, partly due to the immune system’s response to the disease. This tends to be more common in later stages.

Difficulty swallowing can occur, particularly when a tumor develops near where the stomach meets the esophagus.

Some people describe a sensation that food isn’t going down properly, even when no physical blockage is obvious. Persistent symptoms should be evaluated by a healthcare professional.

Frequent night sweats that soak clothing or bedding can point to an underlying health issue.

They may be linked to infections, hormonal changes, or cancers such as stomach cancer. When they occur without a clear cause and alongside other symptoms, they warrant medical attention.

Unusual bruising or bleeding without a clear cause can be a warning sign of underlying health problems.

While not a primary symptom of stomach cancer, it can be associated with broader changes in the body. An increase in unexplained bruising should be evaluated by a healthcare provider.

Changes in moles are most often associated with skin cancer, but broader systemic changes in the body can sometimes affect the skin as well.

Any mole that changes in size, shape, color, or texture should be examined by a dermatologist to rule out serious conditions.

Recurring infections — such as respiratory or urinary tract infections — may signal that the immune system is under strain.

In some cases, infections like H. pylori are linked to an increased risk of stomach cancer. Ongoing or unusual patterns of illness should be evaluated to determine the cause.

Shortness of breath, especially when it interferes with daily life, should always be taken seriously.

It can stem from a range of causes, including anemia, which may result from internal bleeding associated with stomach cancer. Persistent or unexplained symptoms require medical evaluation.