.Some people find that the powerful medicines used for chemotherapy treatment make them not able to think clearly or have a "fuzzy memory." If you've noticed this, it's not all in your head. It's real, something that people with cancer often call "chemobrain" or "chemo fog." Read on to learn more.

Here is a primer on health research so you can better understand human studies.

Fatigue can come and go or stay constant for a while. Fatigue from chemotherapy tends to happen a few days after the treatment, peaks, and then gets better before the next treatment. Fatigue from radiation may not happen right away.

Fatigue is a feeling of being tired, weak, or exhausted. It's the most common side effect of cancer and cancer treatment.

Learn about how surgery is used to treat head and neck cancer, and what to expect before and after surgery.

An overview of common treatments for head and neck cancer.

The stage of a cancer is how much and how far the cancer has spread in your body. Different head and neck cancers are staged in different ways. Learn about the stages of some of the more common types of head and neck cancer.

If your healthcare provider thinks you might have head and neck cancer, you will need certain exams and tests to be sure. Here's a look at what you can expect.

Many of the symptoms of head and neck cancer can be caused by other health problems. But it's important to see your healthcare provider if you have these symptoms.

After a diagnosis of head and neck cancer, you will likely have other tests. These tests help your healthcare providers learn more about your cancer.