The prostate and what goes wrong

Prostate cancer starts when cells in the prostate gland begin to grow in an uncontrolled way. The prostate is a walnut-sized gland that sits below the bladder in men and produces fluid that mixes with sperm to make semen. In most cases, prostate cancer grows slowly and may not cause serious harm for years or even decades. Some men with prostate cancer never experience symptoms or problems from it. Other men develop cancer that grows faster and spreads beyond the prostate, which is when treatment becomes necessary.

Doctors divide prostate cancer into stages based on how far it has spread. Early-stage cancer is confined to the prostate itself. Advanced cancer has spread to nearby tissues, lymph nodes, or distant parts of the body like the bones or lungs. The stage of your cancer, along with other factors like your age and overall health, determines what treatment options make sense for you.

Key Takeaways

  • Prostate cancer starts in the prostate gland and often grows slowly, meaning many men never experience serious problems from it.
  • A blood test called PSA (prostate-specific antigen) and a digital rectal exam are the main screening tools doctors use to detect prostate cancer early.
  • A biopsy—taking small tissue samples from the prostate—is the only way to confirm whether cancer is present.
  • Doctors use imaging tests like MRI or CT scans to determine whether cancer has spread beyond the prostate.
  • Treatment options include surgery, radiation, hormone therapy, and active monitoring, depending on the stage and how fast the cancer is growing.

How doctors screen for prostate cancer

Screening means looking for cancer in men who have no symptoms. Two main tests are used. The first is a blood test that measures PSA (prostate-specific antigen), a protein made by the prostate. Higher PSA levels can signal cancer, but they can also rise from other prostate problems like infection or benign enlargement. The second is a digital rectal exam (DRE), where a doctor inserts a gloved finger into the rectum to feel the prostate for lumps or hard areas.

Whether you should be screened depends on your age and risk factors. Men aged 50 to 69 with average risk may choose screening after discussing the benefits and risks with their doctor. Men at higher risk—including Black men and those with a family history of prostate cancer—may start screening at age 40 or 45. Screening can catch cancer early, but it can also lead to false alarms and unnecessary biopsies. Your doctor can help you decide whether screening makes sense for you.

Confirming cancer with a biopsy

If screening tests suggest cancer might be present, your doctor will order a prostate biopsy. During this procedure, a doctor uses an ultrasound probe inserted into the rectum to guide a thin needle that takes 10 to 12 small tissue samples from different parts of the prostate. The procedure takes about 10 to 15 minutes and is usually done in an outpatient clinic. You may feel pressure or brief discomfort, but the area is numbed beforehand.

A pathologist then examines the tissue samples under a microscope to look for cancer cells. If cancer is found, the pathologist assigns it a Gleason score, which ranges from 2 to 10 and describes how abnormal the cells look. A lower score means the cancer looks more like normal prostate tissue and tends to grow slowly. A higher score means the cells look very different from normal tissue and the cancer is more likely to grow and spread quickly. The Gleason score is one of the most important pieces of information your doctor uses to plan treatment.

Imaging tests to check if cancer has spread

Once cancer is confirmed, your doctor will order imaging tests to see whether it has spread beyond the prostate. An MRI (magnetic resonance imaging) scan uses magnetic fields and radio waves to create detailed pictures of the prostate and surrounding tissues. A CT (computed tomography) scan uses X-rays to create cross-sectional images and is often used to check whether cancer has reached lymph nodes or distant organs.

For men with higher-risk cancer, a bone scan or PET scan may be ordered to check whether cancer has spread to the bones or other parts of the body. These tests help your doctor understand the full extent of the cancer and determine which treatments are most appropriate. The results, combined with your PSA level and Gleason score, give your doctor the information needed to stage your cancer and discuss your options with you.

Understanding your cancer stage and risk level

Doctors use a system called TNM staging to classify prostate cancer. The T describes the size and location of the tumor within the prostate. The N describes whether cancer has spread to nearby lymph nodes. The M describes whether cancer has spread to distant sites. Stages range from 1 (cancer confined to the prostate and not likely to spread) to 4 (cancer has spread beyond the prostate).

Your doctor may also describe your cancer as low-risk, intermediate-risk, or high-risk based on the Gleason score, PSA level, and stage. This risk classification helps guide treatment decisions. Low-risk cancers often grow so slowly that active monitoring—regular PSA tests and exams without immediate treatment—may be appropriate. Higher-risk cancers usually require more aggressive treatment like surgery or radiation to prevent spread.

Treatment options after diagnosis

The main treatment options for prostate cancer are surgery, radiation therapy, hormone therapy, and active monitoring. Surgery (radical prostatectomy) removes the entire prostate and surrounding tissue and is often used for cancer that has not spread. Radiation therapy uses high-energy beams to kill cancer cells and may be delivered from outside the body (external beam) or by placing radioactive seeds directly in the prostate (brachytherapy).

Hormone therapy blocks testosterone, which fuels prostate cancer growth, and is often used for advanced cancer or alongside radiation. Active monitoring means regular PSA tests and digital rectal exams without immediate treatment—an option for men with low-risk, slow-growing cancer who want to avoid the side effects of surgery or radiation. Your doctor will discuss which option or combination of options makes the most sense based on your cancer stage, age, overall health, and personal preferences.

Side effects and what to expect during treatment

Surgery and radiation can cause side effects including urinary incontinence (loss of bladder control), erectile dysfunction (difficulty with erections), and bowel problems. These side effects may be temporary or permanent, and their severity varies from person to person. Hormone therapy can cause hot flashes, weight gain, fatigue, and loss of sexual desire. Your doctor will discuss the likelihood and severity of side effects for your specific treatment plan before you begin.

Treatment typically takes several weeks to several months depending on the type. Surgery is usually a one-time procedure followed by recovery. Radiation therapy is usually given five days a week for six to nine weeks. Hormone therapy may continue for months or years. Your medical team will monitor you closely during and after treatment with PSA tests and imaging to check how well the treatment is working and to catch any side effects early.

Frequently Asked Questions

What does a high PSA number mean?

A high PSA can signal prostate cancer, but it can also result from infection, benign enlargement, or even recent ejaculation or vigorous exercise. PSA levels also rise naturally with age. Your doctor will look at your PSA trend over time, your age, and other factors before deciding whether a biopsy is needed.

Can prostate cancer be prevented?

There is no proven way to prevent prostate cancer, but some research suggests that a diet rich in vegetables, maintaining a healthy weight, and regular exercise may lower risk. Screening and early detection are the main ways to catch cancer when it is most treatable.

What is the difference between prostate cancer and benign prostate enlargement?

Benign prostate enlargement (BPH) is a non-cancerous growth that occurs naturally with age and can cause urinary symptoms like frequent urination or weak urine flow. Prostate cancer is a malignant growth that can spread. Both can raise PSA levels, which is why a biopsy is needed to tell them apart.

How often do I need follow-up tests after treatment?

After treatment, you will have PSA tests and digital rectal exams at regular intervals—typically every three to six months for the first year, then less frequently if PSA remains low. Your doctor will set a schedule based on your cancer stage and treatment type. Regular follow-up helps catch any recurrence early.

What if my cancer comes back after treatment?

Recurrence can happen months or years after treatment. If PSA rises again, your doctor may order imaging tests and discuss additional treatment options, which might include radiation (if surgery was done first), hormone therapy, or clinical trials. The approach depends on how much time has passed and what treatments you have already received.