Other signs are listed on information for older people. And don't forget to speak to your practice nurse or GP.
To measure mid upper-arm circumference - a way of telling if someone is underweight - you can use any tape measure.
Watch the video about how to use it.
Or follow these instructions:
- First find the middle point of your upper arm. You'll probably need help when you do this. Ask a relative, carer or friend.
- Bend your left arm at the elbow so that it’s at a right angle (90 degrees).
- Measure the distance between the top of your shoulder and the point of your elbow, down the left outside of your arm.
- Mark the mid-point with washable ink. For example, if your measurement is 32cm, the mid-point is 16cm.
- Then measure your mid-upper arm circumference (abbreviated to MUAC) and hang your arm loose.
- Measure around the upper arm at the mid-point you have just marked. The tape should touch your skin all the way around but not be pulled too tightly.
- If your MUAC measurement is 23.5cm or less then you should seek further advice.
- Ask your doctor or your practice nurse if you need to address your weight. You may be underweight and need to boost your food intake.
- If your MUAC is more than 32cm, you may need help to lose weight.