US Trends

what causes prostate cancer

Prostate cancer does not have a single clear cause, but it develops when genetic changes make prostate cells grow out of control and form a tumor. Scientists understand many risk factors and biological mechanisms, but in most men, we cannot say exactly why it started.

Key idea: what’s happening in the body

Inside the prostate, normal cells can acquire DNA damage (mutations) over many years.

These changes can:

  • Activate “oncogenes,” which push cells to grow and divide too fast.
  • Switch off “tumor suppressor genes,” which normally act as brakes or trigger damaged cells to die.
  • Damage DNA repair genes so mistakes in DNA keep accumulating.

When enough of these changes build up, a group of abnormal cells can become cancerous and form a tumor in the prostate.

Inherited (hereditary) causes

Some men are born with gene changes that raise their risk throughout life.

Important inherited factors include:

  • BRCA1 and especially BRCA2 mutations (well‑known for breast/ovarian cancer, but also raise prostate cancer risk).
  • Lynch syndrome (DNA mismatch repair gene mutations such as MLH1, MSH2, MSH6, PMS2) which increase risks for colorectal and prostate cancer, among others.
  • Rare mutations like HOXB13, linked to early‑onset prostate cancer that runs strongly in some families.
  • Other genes such as RNASEL (formerly HPC1), which normally help damaged cells die but, when mutated, may let abnormal cells survive longer.

If a father, brother, or multiple close relatives have prostate cancer—especially at younger ages—your risk is higher, partly because of these inherited changes.

Acquired (lifetime) changes and hormones

Most prostate cancers are thought to be caused by DNA changes that happen during life rather than at birth.

Factors that may influence these changes include:

  • Androgens (male hormones like testosterone and dihydrotestosterone) that promote prostate cell growth; higher levels may contribute to risk in some men, though studies are not fully consistent.
  • Possible effects of insulin‑like growth factor‑1 (IGF‑1), with some research suggesting high levels may increase risk, but other studies not confirming this; research is ongoing.
  • Chronic inflammation in the prostate, which may damage DNA and help normal cells evolve into cancer cells; this link is still under study.

These are not direct “causes” in the simple sense, but they may create an environment where genetic damage is more likely to lead to cancer.

Established risk factors (who is more likely to get it?)

Doctors focus on risk factors rather than one single cause. Major ones include:

  • Age: risk rises sharply after about age 50; most cases occur in older men.
  • Family history: having a father or brother with prostate cancer can roughly double risk, especially if they were diagnosed before age 55 or multiple relatives are affected.
  • Inherited gene mutations: BRCA1/2, Lynch syndrome, HOXB13 and other DNA repair gene changes.
  • Race/ethnicity: in many countries, Black men have higher rates and are more likely to develop aggressive disease; this pattern is seen in current epidemiologic data, though causes likely combine genetics and social factors.
  • Obesity: linked to a higher chance of aggressive, fast‑growing prostate cancer and higher risk of the cancer returning after treatment.
  • Diet: patterns high in red/processed meat and high‑fat dairy and low in fruits and vegetables have been associated with increased risk in some studies.
  • Workplace exposures: contact with certain toxic chemicals has been linked to higher risk in some occupational studies.
  • Smoking: some research connects smoking with greater risk of aggressive disease and recurrence, though findings are mixed.

Notably, common questions like “Does masturbation or lack of sex cause prostate cancer?” have not shown clear evidence of causation; these are widely discussed online but not supported as main risk drivers.

Today’s “latest news” and research direction

As of 2025–2026, research on what causes prostate cancer is focusing on:

  • Better mapping of genetic profiles (which exact mutation patterns lead to which tumor behavior).
  • Understanding how inflammation, the microbiome, and metabolic health (obesity, insulin resistance) interact with the prostate.
  • Refining who should get early screening, particularly men with strong family history or known high‑risk gene mutations.
  • Developing targeted therapies and immunotherapies that exploit specific gene defects in prostate tumors (for example, DNA repair defects).

Quick FAQ style recap

  • Is there one single cause?
    • No. It is usually a mix of genetic changes plus age, hormones, and environmental or lifestyle factors.
  • Can I inherit prostate cancer?
    • You cannot inherit the cancer itself, but you can inherit gene changes that greatly increase risk (such as BRCA2 or Lynch‑related genes).
  • Does lifestyle matter?
    • Yes. Weight, diet, smoking, and possibly chemical exposures can influence risk and how aggressive a cancer may be.
  • Can we always say “this” caused “that” case?
    • For an individual man, usually not. We can list risk factors and gene changes, but pinpointing a single trigger is rarely possible.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.