Does obstructive sleep apnoea cause unexplained weight gain?

Obstructive sleep apnoea fragments sleep and can leave a person tired during the day. Poor sleep may affect appetite, activity, meal timing and the body's handling of energy. Weight around the neck and upper airway can also narrow the breathing passage, creating a reinforcing cycle. This does not mean every change in weight is caused by apnoea; medicines, thyroid problems, fluid retention, mood and other health conditions may also contribute.

Record when the weight change began, how quickly it developed, and whether it came with loud snoring, witnessed pauses, morning headaches or daytime sleepiness. Arrange a clinical review rather than trying to explain the change from weight alone. Your clinician can review medicines, examine you and decide whether sleep testing or other checks are appropriate. Choose gradual, sustainable changes in meals, movement and sleep routine if these are safe for you.

Arrange prompt care for rapid or unexplained weight change with breathlessness, leg swelling, marked weakness or persistent vomiting. Seek urgent help for severe shortness of breath, chest pain, fainting, confusion or swelling that develops suddenly. Severe sleepiness that affects driving also needs immediate attention; do not drive while unable to stay alert.

Could sleep apnoea be contributing to my weight change and fatigue? Which medicines or health problems should we check? Would a sleep assessment or blood tests help clarify the cause?