How is unexplained weight loss treated?

Assessment usually covers appetite, swallowing, bowel changes, pain, dental problems, mood, activity, medicines and access to food. A clinician may examine you and arrange blood tests or scans based on your symptoms. Possible causes include thyroid or digestive problems, infection, depression, medicine effects and cancer. Some cancers cause cancer cachexia, in which inflammation and changes in metabolism reduce muscle and appetite; simply eating more may not correct it. Treatment therefore needs to address the illness as well as food intake.

Keep a simple record of meals, appetite, symptoms and weight trends, and take it to your appointment. Choose small, frequent meals and nourishing drinks if eating feels difficult. A dietitian can suggest energy- and protein-rich options that fit your symptoms and treatment. Ask about mouth care, nausea, constipation, swallowing support or pain relief if these interfere with eating. Do not take appetite stimulants or supplements without checking for interactions with prescribed treatment.

Arrange prompt medical assessment if weight loss is continuing, unexplained or accompanied by trouble swallowing, repeated vomiting, blood in the stool, a persistent cough, night sweats, marked thirst or unusual fatigue. Seek urgent help if you cannot keep fluids down, feel faint, become confused or have severe weakness. People receiving cancer treatment should report reduced intake early because dehydration and loss of muscle can affect treatment tolerance.

Ask which causes fit your symptoms, whether you need a dietitian, how to manage eating-related symptoms, which supplements are compatible with treatment, and what change should prompt an earlier review.