Unexplained Weight Loss and Prostate Cancer

Unexplained weight loss can have many causes, and prostate cancer is one possibility that needs medical assessment rather than self-diagnosis. Weight loss may occur when an illness changes appetite, digestion, energy use or the body's inflammatory response. Prostate cancer may cause no symptoms early on, while more advanced disease can be associated with appetite loss, tiredness, bone pain or weight loss. These symptoms are not specific to prostate cancer.

Unintentional weight loss means losing weight without deliberately changing food intake or activity. It can follow stress, low mood, dental or swallowing problems, medication effects, infection, hormone conditions or digestive disease. For example, conditions such as Hyperthyroidism, Coeliac Disease and Crohn's Disease can affect appetite, absorption or energy needs. Depression can also reduce appetite or make regular meals harder.

Weight loss alone cannot identify its cause. A clinician will consider how quickly it developed, whether appetite has changed, and whether there are urinary symptoms, bowel changes, fever, night sweats, pain or unusual thirst. Prostate-related symptoms can include difficulty starting urine flow, a weaker stream, needing to urinate often or blood in urine; these can also have non-cancerous causes.

Arrange an appointment with a general practitioner if weight loss is ongoing, noticeable or unexplained. Before the visit, note your weight trend, appetite, meals, medicines and supplements, and any urinary, bowel or pain symptoms. A clinician may examine you and decide whether blood or urine tests, prostate assessment or further investigations are appropriate. The choice depends on your age, symptoms, medical history and examination findings.

Do not start a restrictive diet to try to control the change while the cause is unclear. Keep taking prescribed medicines unless a clinician advises otherwise, and mention any difficulty eating or drinking. Other conditions that may need assessment include Type 1 Diabetes, Type 2 Diabetes, HIV Infection and Tuberculosis.

Seek urgent medical help for inability to pass urine, severe or rapidly worsening pain, confusion, fainting, repeated vomiting, or signs of severe dehydration. Arrange prompt clinical review for weight loss with blood in urine or stool, persistent fever or night sweats, a new lump, marked weakness, or pain that is persistent or wakes you at night.

These warning signs do not diagnose prostate cancer, but they should not be ignored. If you feel acutely unwell, contact local emergency services rather than waiting for a routine appointment.

You could ask: What causes should we consider besides prostate cancer? Do my urinary or other symptoms need testing? Which examination or tests are suitable for me? How should I monitor my weight and appetite while we investigate? When should I seek earlier help if symptoms change?