# Symptoms and stages of neuroendocrine tumors
Neuroendocrine tumors (NETs) form a very diverse group of diseases. The disease course and symptoms depend heavily on where the tumor grows, how quickly it grows, what substances the tumor cells secrete, and whether there are metastases. This tab describes the most common stages and what you can expect in each.
Early stage (localized tumor)
In this stage, the tumor is present only at the place where it originated. In many patients, this initially causes no or very few symptoms, which is why the tumor is sometimes discovered by chance — for example, through examinations done for another reason.
**Possible symptoms and complaints:**
- **No complaints** (in approximately half of patients in this stage)
- A subtle abdominal complaint, such as a dull feeling or mild discomfort in the abdomen or chest
- Mild fatigue or lack of energy
- Small irregularities in bowel movements (constipation or diarrhea)
- In tumors in hormone-producing organs (pancreas, intestines, lungs, adrenal glands): hormonal symptoms, such as unexplained high blood pressure, unexpected blood sugar irregularities, or one-sided facial muscles that move involuntarily
**Meaning for daily life:**
For many people, this stage feels almost normal. When symptoms are present, they are usually mild and can easily be attributed to something else. This can lead to patients not knowing what they have for a long time.
**Figures about this phase: **
The duration of this stage varies enormously. Some NETs grow very slowly (years without visible change), others grow faster. This depends heavily on the type of tumor, its location, and its genetic characteristics — factors that vary greatly from patient to patient.
---
Locally advanced tumor (without metastases)
In this stage, the tumor has grown larger and can put pressure on nearby organs or blood vessels, but there are no metastases in other organs yet.
**Possible symptoms and complaints:**
- Abdominal pain or pain at the tumor site (can be mild to moderate, but also severe)
- Abdominal bloating and a feeling of fullness in the belly
- Diarrhea or constipation, sometimes alternating
- Nausea and sometimes vomiting
- Weight loss (unexplained and gradual)
- Fatigue and weakness
- In tumors in certain hormone-producing locations: intensification of hormonal symptoms (for example, more frequent blood pressure spikes, more skin spots, more puffiness around the eyes)
- Sometimes visible abdominal swelling
**Meaning for daily life:**
Pain and discomfort can affect appetite and sleep. Weight loss and fatigue make daily work and activities more difficult. Some patients now already need regular appointments for examinations and treatment.
**Figures about this phase: **
Individual differences are also large here. How quickly a tumor grows depends on the tumor type, the degree of cell irregularity (grading), and other biological characteristics. Average survival rates for localized NETs cannot be stated independently of tumor type and stage; this ranges from tens of months to many years. Treatment (surgery, medication) significantly affects the course.
---
Metastasized tumor (with metastases)
This stage occurs when cancer cells have spread via blood or lymph vessels to other organs. With NETs, this happens relatively more often than with many other cancers; it can occur at the same time as discovery of the primary tumor, but also years later.
**Possible symptoms and complaints:**
- All symptoms from previous stages can be present and are usually more severe
- Symptoms related to the location of metastases:
- **Liver metastases** (most frequent): abdominal bloating, yellowing of skin and eyes, diarrhea, pain in the upper right abdomen
- **Bone metastases**: bone pain, especially in spine, pelvis, and ribs; sometimes fractures
- **Lung metastases**: cough, shortness of breath, possibly coughing up blood
- **Brain metastases** (rare): headache, balance disorders, changes in perception or thinking
- Worsening of hormonal symptoms (blood sugar and blood pressure problems, flushing, diarrhea)
- Severe fatigue and weakness
- Weight loss (can be significant)
- Reduced appetite
- Possible symptoms of liver insufficiency (fluid accumulation, confused thoughts)
**Meaning for daily life:**
This phase requires substantial adjustments. Work activities can often no longer be performed fully or at all. Hospital visits and treatments take up more time. Physical well-being decreases, affecting independence and social activities. Many patients notice they tire more quickly and need help sooner.
**Figures about this phase: **
The prognosis for metastatic NET varies greatly depending on the type. For some NET types, median survival (the point at which half of patients are still alive) is approximately 5 to more than 10 years; for more aggressive types this can be shorter. These figures apply to large patient groups and are averages — they say nothing about how it will progress for one specific patient. Treatment with somatostatin analogues, chemotherapy, targeted agents, or immunotherapy can improve disease progression and relieve symptoms, but this varies greatly by tumor and by patient.
---
Advanced phase with treatment limitations
Sometimes the disease reaches a phase in which further tumor-directed treatment provides no benefit, or in which side effects outweigh benefits. This can also happen much earlier than expected, depending on the tumor's growth rate and response to treatments.
**Possible symptoms and complaints:**
- Almost all symptoms from previous phases may be present and are usually severe
- Acute problems, such as severe abdominal pain, icterus (jaundice), kidney or liver dysfunction disorders
- Worsening of malnutrition and muscle loss
- Poor sleep
- Anxiety and depression
- Possible pain, especially with bone metastases
- Shortness of breath (with lung involvement)
- Confusion or disorientation (especially with liver metastases or brain involvement)
**Meaning for daily life:**
At this point, palliative care (focused care on quality of life and symptom management) is central. Many activities that used to happen automatically now require help. Pain and symptom management become much more important than tumor control. This is also the time when many patients think about their wishes for the final period of their life.
**Figures about this phase: **
Average survival in this phase can range from months to several years, depending on the tumor type, how quickly it grows, and the patient's health status. These figures are very rough and vary greatly between individuals. They are intended to help caregivers and patients plan, not to predict how long someone has left to live.
---
When should you talk to your doctor?
It's good to contact your GP or hospital doctor if you:
- Develop new, severe, or increasing abdominal pain
- Lose weight suddenly and significantly
- Show signs of jaundice (yellow eyes, yellow skin)
- Develop severe diarrhea that doesn't go away
- Develop severe or unexplained headache
- Develop shortness of breath or severe pain
- Feel confused or don't feel like yourself
- Have symptoms that worry you or that seriously limit your daily life
You don't need to wait until your next scheduled appointment if you feel very unwell or suspect something serious.
---
_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._