Neuroendocrine Tumor Symptoms

Since neuroendcrine tumors (NETs) can form anywhere in the body, symptoms will vary depending on where the tumor is located.

General cancer symptoms:

NETs can cause symptoms that are common to many cancers. These include:

• Fatigue
• A new, growing lump or mass
• Unexplained weight loss

Gastrointestinal NET symptoms

Symptoms of gastrointestinal nets are similar to those of other GI tract cancers. These include:

• Rectal bleeding and/or blood in the stool
• A change in size, shape or color of the stool
• Discomfort or urge to have a bowel movement when there is no need
• Bloating or a feeling of fullness
• Unexplained weight loss
• Pain in the abdomen or lower back

Lung NET symptoms

Many lung cancers are NETs. As such, their symptoms match general lung cancer symptoms. View our list of lung cancer symptoms.

Pancreatic NET symptoms

The symptoms of pancreatic NETs are similar to other pancreatic cancers. Learn more about pancreatic neuroendocrine tumors.

Functional NET symptoms

Functional NETs are NETs that produce hormones. Like all NETs, these can appear anywhere in the body. The hormones they release can cause physical symptoms and lead to changes in behavior. In addition to symptoms related to their location, the symptoms of functional NETs may include:

• Persistent flushing of the face
• Persistent, often severe diarrhea
• Severe gastric ulcers
• High blood sugar or low blood sugar
• Changes in bathroom habits, including diarrhea and frequent urination
• Dizziness or shakiness
• Anxiety or confusion

Learn more about neuroendocrine tumors:

• Neuroendocrine tumor diagnosis
• Neuroendocrine tumor treatment