Interpret symptoms and warning signs correctly

Experts clarify warning signs

How do you know you have cancer?


Updated 10/11/2025 – 8:00 amReading time: 6 minutes

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Breast pain: Breast cancer usually only causes pain in advanced stages. (Source: PORNCHAI SODA)

Detecting cancer early can save lives. However, the symptoms of various types of cancer are very different. What you can pay attention to.

Regarding cancer, it is important to detect it early. The milder the disease, the better the healing. The problem: There are many different types of cancer. Depending on the type of tumor and where the tumor originates, the symptoms vary. Therefore, warning signs can appear very differently. So you don’t always recognize cancer right away. However, there are some common symptoms that experts say you should be aware of.

Cancer can occur in almost any tissue. Symptoms often only appear when the tumor grows and damages surrounding tissues and organs. This is why fast-growing cancers can be spotted early. However, for some types of cancer, the warning signs are subtle and easy to ignore.

According to experts at the German Cancer Society, common warning signs of possible cancer are:

Important: Many symptoms can also be triggered by other diseases. However, if these symptoms do not go away or get worse, you should see a doctor.

The symptoms above can indicate various types of cancer. But not all of them are widespread. Currently, the most common cancer in men in Germany is prostate cancer, followed by lung and colon cancer. Breast cancer most often attacks women, followed by colon and lung cancer. About 500,000 people are diagnosed with cancer every year.

For these four types of cancer, common symptoms to look out for are listed below.

However, if there are certain symptoms, the German Cancer Society advises men to see a urologist to find out the cause. These include:

Health insurance companies are required to pay for annual prostate examinations by a urologist from age 45. Anyone with a family history of prostate or breast cancer is entitled to screening from age 40.